US3773075A - Fuel burner assemblies - Google Patents

Fuel burner assemblies Download PDF

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Publication number
US3773075A
US3773075A US00201874A US3773075DA US3773075A US 3773075 A US3773075 A US 3773075A US 00201874 A US00201874 A US 00201874A US 3773075D A US3773075D A US 3773075DA US 3773075 A US3773075 A US 3773075A
Authority
US
United States
Prior art keywords
venturi
nozzle
fuel
throat
burner assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00201874A
Inventor
M Thompson
R Pearce
D Howard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Airoil Burner Co Ltd
Airoil Flaregas Ltd
Original Assignee
Airoil Burner Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Airoil Burner Co Ltd filed Critical Airoil Burner Co Ltd
Application granted granted Critical
Publication of US3773075A publication Critical patent/US3773075A/en
Assigned to AIROIL FLAREGAS LIMITED reassignment AIROIL FLAREGAS LIMITED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AIROIL BURNER COMPNY (G.B.) LIMITED
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F23D14/64—Mixing devices; Mixing tubes with injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D91/00—Burners specially adapted for specific applications, not otherwise provided for
    • F23D91/02—Burners specially adapted for specific applications, not otherwise provided for for use in particular heating operations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2206/00—Burners for specific applications
    • F23D2206/0094—Gas burners adapted for use in illumination and heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2210/00—Noise abatement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/00011—Burner with means for propagating the flames along a wall surface
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87571—Multiple inlet with single outlet
    • Y10T137/87587—Combining by aspiration
    • Y10T137/87603—Plural motivating fluid jets

Definitions

  • the present invention relates in general to a fuel burner assembly and has for its object the reduction of operating noise.
  • venturi may be of various configurations, for example, the venturi may have a throat in the form of a longitudinal section of constant minimum diameter or else the venturi can converge to a point of minimum diameter forming the throat.
  • the invention is based upon the discovery that by using a number of jets such as 4, 6 or more in the nozzle and advancing the nozzle forwardly towards the venturi from the position that it would normally adopt a significant reduction in operating noise can be achieved.
  • a burner assembly composed of a venturi and a fuel nozzle arranged to discharge fuel into said venturi so that air will be inspirated into the venturi, wherein the nozzle has a plurality of jets through which said fuel is passed and the distance between the fuel-emittingend of the nozzle and the centre of the venturi throat is within the range 0.5 to 1.5 venturi throat diameters.
  • a further reduction in noise can be achieved by additionally forming the inlet portion of the venturi facing the nozzle from a hollow member filled with an acoustic damping material.
  • FIG. 1 is a schematic sectional side view of part of a known fuel burner assembly
  • FIG. 2 is a part sectional side view of another known fuel burner assembly employing an elbow venturi
  • FIG. 3 is a diagrammatic and enlarged view of part of a fuel burner assembly made in accordance with the invention and particularly depicting the relative positions of the nozzle and venturi throat;
  • FIG. 4 is a schematic sectional side view of an alternative venturi throat construction for use in an assembly made in accordance with the invention.
  • a known burner assembly is composed of a fuel nozzle disposed in a casing 11 to which a venturi 12 is attached. At the end of the venturi 12 remote from the casing 1 1 there is disposed a flame nozzle 13.
  • the venturi 12 would be supported in the wall of a furnace so that a horizontally disposed combustion flame is established by the nozzle 13 within the furnace.
  • Fuel more usually gas is fed to the nozzle 10 and the propulsion of the fuel from a single jet or orifice in the nozzle 10 serves to inspirate primary combustion air into the casing 11 from whence the fuel/air mixture passes through the throat 14 of the venturi 12 for subsequent combustion.
  • FIG. 2 a complete burner assembly employing an elbow venturi instead of a straight venturi is shown and for convenience like numerals denote like parts to FIG. 1.
  • the operation of the assembly of FIG. 2 is essentially as described in connection with FIG. 1 but additionally illustrated in FIG. 2 are the walls 20 of a furnace, a device 21 for adjusting the quantity of primary air, and a device 22 for adjusting the quantity of secondary air.
  • the present invention is based upon the somewhat surprising discovery that by modifying the position of the nozzle 10 in relation to the venturi 12 and by increasing the number of jets in the nozzle 10 the burner will operate at a reduced noise level.
  • FIG. 3 depicts, in schematic form, a typical arrangement made in accordance with the invention.
  • the dimension d can be taken as the smallest internal diameter of the venturi 12.
  • the nozzle 10 has a plurality of jets 30 preferably exceeding four. The collective area of such holes is equivalent to the area of a single conventional jet and is chosen to match the particular fuel flow rate in question.
  • the operating noise of the assembly can be further reduced by modifying the inlet part 40 of the venturi 12 as shown in FIG. 4.
  • the inlet part 40 of the venturi 12 is formed from a hollow member with a perforated inner wall 41 and an outer wall 42.
  • a fibre-glass material 43 or similar acoustic absorbing material is sandwiched between the walls 41, 42.
  • a burner assembly composed of a venturi and a fuel nozzle arranged to discharge fuel into said venturi so that air will be inspirated into the venturi, wherein the nozzle has a plurality of jets through which said fuel is passed, the distance between the fuel-emitting end of the nozzle and the center of the venturi throat is within the range of 0.5 to 1.5 venturi throat diameters, and the inlet portion of the venturi facing the nozzle is formed as a hollow member with an acoustic absorbing material within the member.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)

Abstract

A fuel burner assembly of the venturi type having its fuel nozzle provided with a plurality of jets and being more forwardly disposed in relation to the venturi than is conventional in order to reduce operating noise.

Description

United States Patent Roberts 239/4165 Thompson et al. Nov. 20, 1973 [54] FUEL BURNER ASSEMBLIES 1,102,751 7/1914 Hicks 239/416.4
1, 09,42 61 31 R berts ....2 41 [76] Invent: Michael when Tlwmlmn; Regimld 1,380,321 11/1334 C leman 3 39 21 6 James Pearce; David Ernest 3,044,537 7/1962 Keating et al. 431 354 H ward, a l of W y 3,659,962 5 1972 Zink 417 179 England 1,878,478 9 1932 Ensign et al. 137 604 x ,838, 12 1 31 h 37 x [73] Asslgnee: Almmume' companywm 514221 1294 1 s 2: 43 19114 Limilewest Drayton, Mlddlesex, 2,964,121 12/1960 Zink, Jr. et al... 431 114 x Englan 2,942,683 6/1960 Moyer 417 312 x [22] Filed: No 24 1971 1,395,139 10 1921 Porter 48 180 0 21] Appl. No.2 201,874
Primary Examiner-Robert G. Nilson [30] Foreign Application Priority Data 7 Attorney-C. Yardley Chittick et al.
Nov. 30, 1970 Great Britain 56,788/70 [52] U.S. Cl 137/604, 239/398, 431/114,
431 354 [57] ABSTRACT [51] hit. Cl. Fl6k 19/00 A fuel burner assembly of the venturi yp having its [58] Fleld 0f Search 137/604; 48/180 C; fuel nozzle provided with a plurality of j and i g 431/114 354; 417/179 312; 239/398 more forwardly disposed in relation to the venturi 239/4165 417's than is conventional in order to reduce operating noise. [56] References Cited UNITED STATES PATENTS 501,164 1893 2 Claims, 4 Drawing Figures Patented Nov. 20, 1973 3,773,075
2 Sheets-Sheet 1 PRIOR ART Patented Nov. 20, 1973 3,773,075
2 Sheets-Sheet 2 PRIOR ART FUEL BURNER ASSEMBLIES BACKGROUND TO THE INVENTION The present invention relates in general to a fuel burner assembly and has for its object the reduction of operating noise.
It is known to provide a burner assembly composed of a venturi and fuel nozzle arranged to discharge fuel into said venturi so that air will be inspirated into the venturi. The venturi may be of various configurations, for example, the venturi may have a throat in the form of a longitudinal section of constant minimum diameter or else the venturi can converge to a point of minimum diameter forming the throat.
SUMMARY OF THE INVENTION In its broadest aspect, the invention is based upon the discovery that by using a number of jets such as 4, 6 or more in the nozzle and advancing the nozzle forwardly towards the venturi from the position that it would normally adopt a significant reduction in operating noise can be achieved.
According to the invention there is provided a burner assembly composed of a venturi and a fuel nozzle arranged to discharge fuel into said venturi so that air will be inspirated into the venturi, wherein the nozzle has a plurality of jets through which said fuel is passed and the distance between the fuel-emittingend of the nozzle and the centre of the venturi throat is within the range 0.5 to 1.5 venturi throat diameters.
A further reduction in noise can be achieved by additionally forming the inlet portion of the venturi facing the nozzle from a hollow member filled with an acoustic damping material.
BRIEF DESCRIPTION OF DRAWINGS The invention may be understood more readily from consideration of the following description in conjunction with the accompanying drawings, wherein:
FIG. 1 is a schematic sectional side view of part of a known fuel burner assembly;
FIG. 2 is a part sectional side view of another known fuel burner assembly employing an elbow venturi;
FIG. 3 is a diagrammatic and enlarged view of part of a fuel burner assembly made in accordance with the invention and particularly depicting the relative positions of the nozzle and venturi throat; and
FIG. 4 is a schematic sectional side view of an alternative venturi throat construction for use in an assembly made in accordance with the invention.
DESCRIPTION OF PREFERRED EMBODIMENT As shown in FIG. 1 a known burner assembly is composed of a fuel nozzle disposed in a casing 11 to which a venturi 12 is attached. At the end of the venturi 12 remote from the casing 1 1 there is disposed a flame nozzle 13. In known manner the venturi 12 would be supported in the wall of a furnace so that a horizontally disposed combustion flame is established by the nozzle 13 within the furnace. Fuel, more usually gas is fed to the nozzle 10 and the propulsion of the fuel from a single jet or orifice in the nozzle 10 serves to inspirate primary combustion air into the casing 11 from whence the fuel/air mixture passes through the throat 14 of the venturi 12 for subsequent combustion.
In FIG. 2 a complete burner assembly employing an elbow venturi instead of a straight venturi is shown and for convenience like numerals denote like parts to FIG. 1. The operation of the assembly of FIG. 2 is essentially as described in connection with FIG. 1 but additionally illustrated in FIG. 2 are the walls 20 of a furnace, a device 21 for adjusting the quantity of primary air, and a device 22 for adjusting the quantity of secondary air.
Assemblies of this general type are well known in this art. In these prior art assemblies the end 31 of the nozzle 10 would either be aligned with the outer surface 92 of the inlet flange 91 of the venturi 12, as depicted by the dotted line in FIG. 1, or else this end 31 would be disposed outwardly from the surface 92, i.e., to the left of FIG. 1, as shown in the full lines in FIGS. 1 and 2. Also in venturi type burners the nozzle 10 normally only has a single central orifice or jet.
The present invention is based upon the somewhat surprising discovery that by modifying the position of the nozzle 10 in relation to the venturi 12 and by increasing the number of jets in the nozzle 10 the burner will operate at a reduced noise level.
In general, it has been found that by displacing the nozzle 10 forwardly (arrow A FIG. I) from the position which it normally adopts, and by employing a plurality of jets in the nozzle 10 instead of a single jet an improvement in the noise characteristics of the burner assembly of around 10 to 20 dBA can be achieved.
FIG. 3 depicts, in schematic form, a typical arrangement made in accordance with the invention. In this case, in contrast to FIGS. 1 and 2, there are a number of jets 30 in the nozzle 10 and the distance x between the end 31 of the nozzle 10 and a reference point 50 in the venturi 12, conveniently taken as the centre of the parallel throat section 14 of the venturi 12 is within the range 0.5 to 1.5 venturi throat diameters d. The dimension d can be taken as the smallest internal diameter of the venturi 12. The nozzle 10 has a plurality of jets 30 preferably exceeding four. The collective area of such holes is equivalent to the area of a single conventional jet and is chosen to match the particular fuel flow rate in question.
The operating noise of the assembly can be further reduced by modifying the inlet part 40 of the venturi 12 as shown in FIG. 4. The inlet part 40 of the venturi 12 is formed from a hollow member with a perforated inner wall 41 and an outer wall 42. A fibre-glass material 43 or similar acoustic absorbing material is sandwiched between the walls 41, 42.
We claim:
1. A burner assembly composed of a venturi and a fuel nozzle arranged to discharge fuel into said venturi so that air will be inspirated into the venturi, wherein the nozzle has a plurality of jets through which said fuel is passed, the the distance between the fuel-emitting end of the nozzle and the center of the venturi throat is within the range of 0.5 to 1.5 venturi throat diameters, and the inlet portion of the venturi facing the nozzle is formed as a hollow member with an acoustic absorbing material within the member.
2. An assembly according to claim 1, wherein the rated.

Claims (2)

1. A burner assembly composed of a venturi and a fuel nozzle arranged to discharge fuel into said venturi so that air will be inspirated into the venturi, wherein the nozzle has a plurality of jets through which said fuel is passed, the the distance between the fuel-emitting end of the nozzle and the center of the venturi throat is within the range of 0.5 to 1.5 venturi throat diameters, and the inlet portion of the venturi facing the nozzle is formed as a hollow member with an acoustic absorbing material within the member.
2. An assembly according to claim 1, wherein the inner wall of the inlet portion of the venturi is perforated.
US00201874A 1970-11-30 1971-11-24 Fuel burner assemblies Expired - Lifetime US3773075A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8678870*A GB1337121A (en) 1970-11-30 1970-11-30 Fuel burner assemblies

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US3773075A true US3773075A (en) 1973-11-20

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US00201874A Expired - Lifetime US3773075A (en) 1970-11-30 1971-11-24 Fuel burner assemblies

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US (1) US3773075A (en)
BE (1) BE775954A (en)
DE (1) DE2154271A1 (en)
ES (1) ES200778Y (en)
FR (1) FR2115853A5 (en)
GB (1) GB1337121A (en)
IT (1) IT941829B (en)
NL (1) NL7115246A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5064825A (en) * 1973-10-06 1975-06-02
US3926544A (en) * 1974-12-30 1975-12-16 Merle L Thorpe Burner system
US4125360A (en) * 1976-10-28 1978-11-14 Envirotech Corporation Steam atomizing burner
WO1983000913A1 (en) * 1981-09-11 1983-03-17 Advanced Mechanical Tech High efficiency gas burner
US4531910A (en) * 1978-05-01 1985-07-30 Geil Paul H Down draft kiln
US4653278A (en) * 1985-08-23 1987-03-31 General Electric Company Gas turbine engine carburetor
US4702691A (en) * 1984-03-19 1987-10-27 John Zink Company Even flow radial burner tip
WO2001057437A1 (en) * 2000-02-04 2001-08-09 Worgas Bruciatori S.R.L. Burner with an extension of the venturi tube
US20040033458A1 (en) * 2000-09-26 2004-02-19 Giorgio Buccilli Low noise modular blade burner
US20060014114A1 (en) * 2004-07-15 2006-01-19 Alexander Groehl Gas-fired heating apparatus
US20090211657A1 (en) * 2004-12-08 2009-08-27 Danfoss A/S Bubble-tolerant micro-mixers
US20090220899A1 (en) * 2006-01-11 2009-09-03 Ntnu Technology Transfer As Method for Burning of Gaseous and Burner
CN108488796A (en) * 2018-05-04 2018-09-04 中国石油集团川庆钻探工程技术有限公司钻采工程技术研究院 Reduce the gas nozzle and burner of noise
US20210231143A1 (en) * 2019-05-20 2021-07-29 Jonathan Jan Device and method for augmenting gas flow

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3573463D1 (en) * 1984-03-19 1989-11-09 Zink Co John Even flow radiant burner tip
DE9006308U1 (en) * 1990-06-05 1990-08-09 Develog, Reiner Hannen & Cie, Corgémont Hand shrinking device
CN110220191A (en) * 2019-07-02 2019-09-10 中国石油集团长城钻探工程有限公司 The controllable open flow gas burner of intake

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US501164A (en) * 1893-07-11 Benjamin roberts
US514631A (en) * 1894-02-13 David p
US1102751A (en) * 1914-03-21 1914-07-07 John Hicks Gas-burner.
US1395139A (en) * 1921-03-12 1921-10-25 Porter Hollis Paine Fuel-burner
US1809425A (en) * 1927-09-27 1931-06-09 Roberts Appliance Corp Gordon Mixing device for gas burners and the like
US1838903A (en) * 1928-02-09 1931-12-29 Surface Combustion Corp Apparatus for forming and burning gaseous mixtures
US1878478A (en) * 1928-09-22 1932-09-20 Ensign Reynolds Inc Inspirator
US1980321A (en) * 1933-08-10 1934-11-13 Thomas A Coleman Gas burner
US2942683A (en) * 1953-06-01 1960-06-28 Phillips Petroleum Co Gas intake silencer
US2964121A (en) * 1958-11-18 1960-12-13 Zink Co John Muffler for gaseous fuel aspirator
US3044537A (en) * 1958-12-11 1962-07-17 Eclipse Fuel Eng Co Gas burner construction
US3659962A (en) * 1970-06-02 1972-05-02 Zink Co John Aspirator

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US501164A (en) * 1893-07-11 Benjamin roberts
US514631A (en) * 1894-02-13 David p
US1102751A (en) * 1914-03-21 1914-07-07 John Hicks Gas-burner.
US1395139A (en) * 1921-03-12 1921-10-25 Porter Hollis Paine Fuel-burner
US1809425A (en) * 1927-09-27 1931-06-09 Roberts Appliance Corp Gordon Mixing device for gas burners and the like
US1838903A (en) * 1928-02-09 1931-12-29 Surface Combustion Corp Apparatus for forming and burning gaseous mixtures
US1878478A (en) * 1928-09-22 1932-09-20 Ensign Reynolds Inc Inspirator
US1980321A (en) * 1933-08-10 1934-11-13 Thomas A Coleman Gas burner
US2942683A (en) * 1953-06-01 1960-06-28 Phillips Petroleum Co Gas intake silencer
US2964121A (en) * 1958-11-18 1960-12-13 Zink Co John Muffler for gaseous fuel aspirator
US3044537A (en) * 1958-12-11 1962-07-17 Eclipse Fuel Eng Co Gas burner construction
US3659962A (en) * 1970-06-02 1972-05-02 Zink Co John Aspirator

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5064825A (en) * 1973-10-06 1975-06-02
US3947226A (en) * 1973-10-06 1976-03-30 Krupp-Koppers Gmbh Combustion system
US3926544A (en) * 1974-12-30 1975-12-16 Merle L Thorpe Burner system
US4125360A (en) * 1976-10-28 1978-11-14 Envirotech Corporation Steam atomizing burner
US4531910A (en) * 1978-05-01 1985-07-30 Geil Paul H Down draft kiln
WO1983000913A1 (en) * 1981-09-11 1983-03-17 Advanced Mechanical Tech High efficiency gas burner
US4419074A (en) * 1981-09-11 1983-12-06 Advanced Mechanical Technology, Inc. High efficiency gas burner
US4702691A (en) * 1984-03-19 1987-10-27 John Zink Company Even flow radial burner tip
US4653278A (en) * 1985-08-23 1987-03-31 General Electric Company Gas turbine engine carburetor
WO2001057437A1 (en) * 2000-02-04 2001-08-09 Worgas Bruciatori S.R.L. Burner with an extension of the venturi tube
US20040033458A1 (en) * 2000-09-26 2004-02-19 Giorgio Buccilli Low noise modular blade burner
US6960077B2 (en) * 2000-09-26 2005-11-01 Worgas Bruciatori S.R.L. Low noise modular blade burner
US20060014114A1 (en) * 2004-07-15 2006-01-19 Alexander Groehl Gas-fired heating apparatus
US7341448B2 (en) * 2004-07-15 2008-03-11 Ceramat, S.Coop. Gas-fired heating apparatus
US20090211657A1 (en) * 2004-12-08 2009-08-27 Danfoss A/S Bubble-tolerant micro-mixers
US20090220899A1 (en) * 2006-01-11 2009-09-03 Ntnu Technology Transfer As Method for Burning of Gaseous and Burner
US8292615B2 (en) * 2006-01-11 2012-10-23 Norwegian University Of Science And Technology (Ntnu) Single stage gaseous fuel burner with low NOx emissions
CN108488796A (en) * 2018-05-04 2018-09-04 中国石油集团川庆钻探工程技术有限公司钻采工程技术研究院 Reduce the gas nozzle and burner of noise
US20210231143A1 (en) * 2019-05-20 2021-07-29 Jonathan Jan Device and method for augmenting gas flow

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Publication number Publication date
ES200778Y (en) 1976-02-16
BE775954A (en) 1972-05-23
DE2154271A1 (en) 1972-06-08
FR2115853A5 (en) 1972-07-07
GB1337121A (en) 1973-11-14
ES200778U (en) 1975-11-01
IT941829B (en) 1973-03-10
NL7115246A (en) 1972-06-01

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AS Assignment

Owner name: AIROIL FLAREGAS LIMITED, VALE ROAD, TONBRIDGE, KEN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:AIROIL BURNER COMPNY (G.B.) LIMITED;REEL/FRAME:003862/0714

Effective date: 19801013