ES8507145A1 - Carbapenem process - Google Patents
Carbapenem processInfo
- Publication number
- ES8507145A1 ES8507145A1 ES537349A ES537349A ES8507145A1 ES 8507145 A1 ES8507145 A1 ES 8507145A1 ES 537349 A ES537349 A ES 537349A ES 537349 A ES537349 A ES 537349A ES 8507145 A1 ES8507145 A1 ES 8507145A1
- Authority
- ES
- Spain
- Prior art keywords
- hydrogen
- formula
- image
- protecting group
- carbapenem
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D477/00—Heterocyclic compounds containing 1-azabicyclo [3.2.0] heptane ring systems, i.e. compounds containing a ring system of the formula:, e.g. carbapenicillins, thienamycins; Such ring systems being further condensed, e.g. 2,3-condensed with an oxygen-, nitrogen- or sulphur-containing hetero ring
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/06—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom containing only hydrogen and carbon atoms in addition to the ring nitrogen atom
- C07D213/16—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom containing only hydrogen and carbon atoms in addition to the ring nitrogen atom containing only one pyridine ring
- C07D213/20—Quaternary compounds thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
- A61P31/04—Antibacterial agents
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/24—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with substituted hydrocarbon radicals attached to ring carbon atoms
- C07D213/28—Radicals substituted by singly-bound oxygen or sulphur atoms
- C07D213/30—Oxygen atoms
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/60—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D213/62—Oxygen or sulfur atoms
- C07D213/63—One oxygen atom
- C07D213/65—One oxygen atom attached in position 3 or 5
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/60—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D213/62—Oxygen or sulfur atoms
- C07D213/70—Sulfur atoms
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/60—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D213/72—Nitrogen atoms
- C07D213/73—Unsubstituted amino or imino radicals
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D233/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings
- C07D233/54—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members
- C07D233/66—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D233/84—Sulfur atoms
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D295/00—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms
- C07D295/04—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms
- C07D295/08—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms substituted by singly bound oxygen or sulfur atoms
- C07D295/084—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms substituted by singly bound oxygen or sulfur atoms with the ring nitrogen atoms and the oxygen or sulfur atoms attached to the same carbon chain, which is not interrupted by carbocyclic rings
- C07D295/088—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms substituted by singly bound oxygen or sulfur atoms with the ring nitrogen atoms and the oxygen or sulfur atoms attached to the same carbon chain, which is not interrupted by carbocyclic rings to an acyclic saturated chain
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D477/00—Heterocyclic compounds containing 1-azabicyclo [3.2.0] heptane ring systems, i.e. compounds containing a ring system of the formula:, e.g. carbapenicillins, thienamycins; Such ring systems being further condensed, e.g. 2,3-condensed with an oxygen-, nitrogen- or sulphur-containing hetero ring
- C07D477/02—Preparation
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/55—Design of synthesis routes, e.g. reducing the use of auxiliary or protecting groups
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Molecular Biology (AREA)
- Communicable Diseases (AREA)
- Oncology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Medicinal Chemistry (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Pharmacology & Pharmacy (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Nitrogen Condensed Heterocyclic Rings (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Pyridine Compounds (AREA)
Abstract
Disclosed is a new and more efficient process for producing carbapenem antibiotic derivatives having a 2- substituent of the general formula S-A-R<14> wherein A represents cyclopentylene, cyclohexylene or C2- C6 alkylene optionally substituted by one or more C1-C4 alkyl groups and R<14> represents a quaternized nitrogen-containing aromatic or non-aromatic heterocycle attached to A through a quaternary nitrogen atom. The carbapenems produced by this process are of the formula < IMAGE > R<8> being hydrogen and R<1> being hydrogen or one of various defined organic groups or R<1> and R<8> together completing a ring and R<2> being hydrogen, an anion or a protecting group. The starting materials are of the formula < IMAGE > and H-S-A-R<14> L being a leaving group and R<2> being a protecting group.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US47137883A | 1983-03-08 | 1983-03-08 | |
US49969183A | 1983-06-07 | 1983-06-07 | |
US55729583A | 1983-12-01 | 1983-12-01 |
Publications (2)
Publication Number | Publication Date |
---|---|
ES8507145A1 true ES8507145A1 (en) | 1985-08-16 |
ES537349A0 ES537349A0 (en) | 1985-08-16 |
Family
ID=27413179
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES530337A Expired ES8505205A1 (en) | 1983-03-08 | 1984-03-07 | Carbapenem process |
ES537349A Granted ES537349A0 (en) | 1983-03-08 | 1984-11-02 | A PROCEDURE FOR THE PREPARATION OF A QUATERNARY AMINOTIOL |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES530337A Expired ES8505205A1 (en) | 1983-03-08 | 1984-03-07 | Carbapenem process |
Country Status (31)
Country | Link |
---|---|
JP (1) | JPH05255250A (en) |
KR (1) | KR900002247B1 (en) |
AR (1) | AR241016A1 (en) |
AT (1) | AT387968B (en) |
AU (2) | AU572124B2 (en) |
CA (1) | CA1284324C (en) |
CH (1) | CH658248A5 (en) |
CY (1) | CY1546A (en) |
DD (1) | DD228258A5 (en) |
DE (1) | DE3408347A1 (en) |
DK (1) | DK140584A (en) |
ES (2) | ES8505205A1 (en) |
FI (1) | FI840863A (en) |
FR (1) | FR2542316B1 (en) |
GB (1) | GB2136802B (en) |
GR (1) | GR81871B (en) |
HK (1) | HK82990A (en) |
HU (1) | HU193895B (en) |
IE (1) | IE57098B1 (en) |
IL (1) | IL71149A (en) |
IT (1) | IT1178465B (en) |
LU (1) | LU85241A1 (en) |
NL (1) | NL8400702A (en) |
NO (1) | NO166038C (en) |
NZ (1) | NZ207346A (en) |
OA (1) | OA07674A (en) |
PT (1) | PT78211B (en) |
SE (2) | SE8401278L (en) |
SG (1) | SG35490G (en) |
YU (2) | YU46147B (en) |
ZW (1) | ZW3884A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4683301A (en) * | 1982-04-08 | 1987-07-28 | Bristol-Myers Company | Carbapenem antibiotics |
US4552696A (en) * | 1982-04-09 | 1985-11-12 | Bristol-Myers Company | Carbapenem antibiotics |
CA1285940C (en) * | 1984-07-02 | 1991-07-09 | Merck & Co., Inc. | Carbapenems having a 2-quaternary heteroarylalkylthio substituent |
IE851586L (en) * | 1984-07-02 | 1986-01-02 | Interchem Internat S A | I methylcarbapenems having a 2-quaternary¹heteroarylalkylthio substituent |
US4665169A (en) * | 1985-09-11 | 1987-05-12 | Bristol-Myers Company | Carbapenem antibiotics |
US4880922A (en) * | 1985-11-22 | 1989-11-14 | Bristol-Myers Company | Carbapenems with quaternized heterothioalkylthio substitution at position 2 |
NZ219892A (en) * | 1986-04-15 | 1991-02-26 | Merck & Co Inc | N-amino quaternised heteroarylium carbapenem derivatives and pharmaceutical compositions thereof |
NZ237191A (en) * | 1990-02-23 | 1992-12-23 | Sankyo Co | 2-((substituted amide) substituted heterocyclylthio) carbpen-2-em derivatives and pharmaceutical compositions |
US5712267A (en) * | 1991-06-04 | 1998-01-27 | Sankyo Company,. Limited | Carbapenem derivatives, their preparation and their use as antibiotics |
JP4648899B2 (en) | 2003-06-12 | 2011-03-09 | ビーティージー・インターナショナル・リミテッド | Cyclic hydroxylamine as a neuroactive compound |
FR2921258A1 (en) * | 2007-09-24 | 2009-03-27 | Oreal | TINCTORIAL COMPOSITION COMPRISING AT LEAST ONE COLOR DISULFIDE / THIOL PRECURSOR, COLORING PROCESS FROM THE COMPOSITION |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55147284A (en) * | 1979-04-17 | 1980-11-17 | Sanraku Inc | Novel beta-lactam derivative and its preparation |
IE52147B1 (en) * | 1980-03-27 | 1987-07-08 | Merck & Co Inc | 4-(3-carboxy-2-oxopropyl)-azetidin-2-ones and process for their preparation |
EP0038869A1 (en) * | 1980-04-30 | 1981-11-04 | Merck & Co. Inc. | Process for the preparation of 1-carbapenems, and intermediates for their preparation |
EP0060612A1 (en) * | 1981-02-04 | 1982-09-22 | Beecham Group Plc | Process for the preparation of azabicyclo(3.2.0)-hept-2-ene derivatives |
US4552873A (en) * | 1981-08-19 | 1985-11-12 | Sankyo Company Limited | Carbapenem compounds, and compositions containing them |
EP0074599A1 (en) * | 1981-09-09 | 1983-03-23 | Takeda Chemical Industries, Ltd. | 5,6-cis-Carbapenem derivatives, their production and use |
US4552696A (en) * | 1982-04-09 | 1985-11-12 | Bristol-Myers Company | Carbapenem antibiotics |
US4536335A (en) * | 1982-06-18 | 1985-08-20 | Bristol-Myers Company | Carbapenem antibiotics |
-
1984
- 1984-02-29 AR AR295877A patent/AR241016A1/en active
- 1984-02-29 DK DK140584A patent/DK140584A/en not_active Application Discontinuation
- 1984-03-01 NZ NZ207346A patent/NZ207346A/en unknown
- 1984-03-05 NL NL8400702A patent/NL8400702A/en not_active Application Discontinuation
- 1984-03-05 ZW ZW38/84A patent/ZW3884A1/en unknown
- 1984-03-05 FI FI840863A patent/FI840863A/en not_active Application Discontinuation
- 1984-03-05 IL IL71149A patent/IL71149A/en unknown
- 1984-03-06 GR GR73999A patent/GR81871B/el unknown
- 1984-03-06 CA CA000448904A patent/CA1284324C/en not_active Expired - Fee Related
- 1984-03-06 CH CH1103/84A patent/CH658248A5/en not_active IP Right Cessation
- 1984-03-07 HU HU84911A patent/HU193895B/en not_active IP Right Cessation
- 1984-03-07 IE IE549/84A patent/IE57098B1/en not_active IP Right Cessation
- 1984-03-07 LU LU85241A patent/LU85241A1/en unknown
- 1984-03-07 FR FR8403553A patent/FR2542316B1/en not_active Expired
- 1984-03-07 DD DD84260663A patent/DD228258A5/en not_active IP Right Cessation
- 1984-03-07 IT IT19945/84A patent/IT1178465B/en active
- 1984-03-07 ES ES530337A patent/ES8505205A1/en not_active Expired
- 1984-03-07 AU AU25360/84A patent/AU572124B2/en not_active Ceased
- 1984-03-07 NO NO840865A patent/NO166038C/en unknown
- 1984-03-07 PT PT78211A patent/PT78211B/en unknown
- 1984-03-07 OA OA58247A patent/OA07674A/en unknown
- 1984-03-07 GB GB08405984A patent/GB2136802B/en not_active Expired
- 1984-03-07 SE SE8401278A patent/SE8401278L/en not_active Application Discontinuation
- 1984-03-07 DE DE19843408347 patent/DE3408347A1/en not_active Withdrawn
- 1984-03-07 AT AT0076984A patent/AT387968B/en not_active IP Right Cessation
- 1984-03-08 KR KR1019840001243A patent/KR900002247B1/en not_active IP Right Cessation
- 1984-03-08 YU YU42084A patent/YU46147B/en unknown
- 1984-11-02 ES ES537349A patent/ES537349A0/en active Granted
-
1986
- 1986-03-28 YU YU49486A patent/YU46305B/en unknown
-
1987
- 1987-07-20 AU AU75924/87A patent/AU605491B2/en not_active Ceased
-
1989
- 1989-04-03 SE SE8901162A patent/SE8901162D0/en not_active Application Discontinuation
-
1990
- 1990-05-19 SG SG35490A patent/SG35490G/en unknown
- 1990-10-11 HK HK829/90A patent/HK82990A/en unknown
-
1991
- 1991-03-22 CY CY1546A patent/CY1546A/en unknown
- 1991-09-27 JP JP3274949A patent/JPH05255250A/en active Pending
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
FD1A | Patent lapsed |
Effective date: 19970505 |