GB1494129A - Derivatives of diaminocyclitols and methods for their preparation - Google Patents
Derivatives of diaminocyclitols and methods for their preparationInfo
- Publication number
- GB1494129A GB1494129A GB2653/75A GB265375A GB1494129A GB 1494129 A GB1494129 A GB 1494129A GB 2653/75 A GB2653/75 A GB 2653/75A GB 265375 A GB265375 A GB 265375A GB 1494129 A GB1494129 A GB 1494129A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gentamicin
- antibiotic
- amino
- diaminocyclitols
- aminoglycosyl
- 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
- 239000002253 acid Substances 0.000 abstract 3
- DNYGXMICFMACRA-UHFFFAOYSA-N gentamicin C1A Natural products O1C(CNC)CCC(N)C1OC1C(O)C(OC2C(C(NC)C(C)(O)CO2)O)C(N)CC1N DNYGXMICFMACRA-UHFFFAOYSA-N 0.000 abstract 2
- LKKVGKXCMYHKSL-LLZRLKDCSA-N gentamycin A Chemical compound O[C@H]1[C@H](NC)[C@@H](O)CO[C@H]1O[C@@H]1[C@@H](O)[C@H](O[C@@H]2[C@@H]([C@@H](O)[C@H](O)[C@@H](CO)O2)N)[C@@H](N)C[C@H]1N LKKVGKXCMYHKSL-LLZRLKDCSA-N 0.000 abstract 2
- CEAZRRDELHUEMR-CAMVTXANSA-N (2r,3r,4r,5r)-2-[(1s,2s,3r,4s,6r)-4,6-diamino-3-[(2r,3r,6s)-3-amino-6-[(1r)-1-(methylamino)ethyl]oxan-2-yl]oxy-2-hydroxycyclohexyl]oxy-5-methyl-4-(methylamino)oxane-3,5-diol Chemical compound O1[C@H]([C@@H](C)NC)CC[C@@H](N)[C@H]1O[C@H]1[C@H](O)[C@@H](O[C@@H]2[C@@H]([C@@H](NC)[C@@](C)(O)CO2)O)[C@H](N)C[C@@H]1N CEAZRRDELHUEMR-CAMVTXANSA-N 0.000 abstract 1
- XUFIWSHGXVLULG-BSBKYKEKSA-N (2r,3r,4r,5r)-2-[(1s,2s,3r,4s,6r)-4,6-diamino-3-[(2r,3r,6s)-3-amino-6-[(1s)-1-aminoethyl]oxan-2-yl]oxy-2-hydroxycyclohexyl]oxy-5-methyl-4-(methylamino)oxane-3,5-diol Chemical compound O1C[C@@](O)(C)[C@H](NC)[C@@H](O)[C@H]1O[C@@H]1[C@@H](O)[C@H](O[C@@H]2[C@@H](CC[C@H](O2)[C@H](C)N)N)[C@@H](N)C[C@H]1N XUFIWSHGXVLULG-BSBKYKEKSA-N 0.000 abstract 1
- BRZYSWJRSDMWLG-DJWUNRQOSA-N (2r,3r,4r,5r)-2-[(1s,2s,3r,4s,6r)-4,6-diamino-3-[(2s,3r,4r,5s,6r)-3-amino-4,5-dihydroxy-6-[(1r)-1-hydroxyethyl]oxan-2-yl]oxy-2-hydroxycyclohexyl]oxy-5-methyl-4-(methylamino)oxane-3,5-diol Chemical compound O1C[C@@](O)(C)[C@H](NC)[C@@H](O)[C@H]1O[C@@H]1[C@@H](O)[C@H](O[C@@H]2[C@@H]([C@@H](O)[C@H](O)[C@@H]([C@@H](C)O)O2)N)[C@@H](N)C[C@H]1N BRZYSWJRSDMWLG-DJWUNRQOSA-N 0.000 abstract 1
- XUSXOPRDIDWMFO-CTMSJIKGSA-N (2r,3r,4r,5r)-2-[(1s,2s,3r,4s,6r)-4,6-diamino-3-[[(2s,3r)-3-amino-6-[(1s)-1-aminoethyl]-3,4-dihydro-2h-pyran-2-yl]oxy]-2-hydroxycyclohexyl]oxy-5-methyl-4-(methylamino)oxane-3,5-diol Chemical compound O1C[C@@](O)(C)[C@H](NC)[C@@H](O)[C@H]1O[C@@H]1[C@@H](O)[C@H](O[C@@H]2[C@@H](CC=C(O2)[C@H](C)N)N)[C@@H](N)C[C@H]1N XUSXOPRDIDWMFO-CTMSJIKGSA-N 0.000 abstract 1
- ABCLPPNEPBAKRL-ROQIPNNMSA-N (2r,3s,4s,5r,6s)-2-[(1r)-1-aminoethyl]-6-[(1r,2r,3s,4r,6s)-4,6-diamino-3-[(2r,3r,4r,5r)-3,5-dihydroxy-5-methyl-4-(methylamino)oxan-2-yl]oxy-2-hydroxycyclohexyl]oxyoxane-3,4,5-triol Chemical compound O1C[C@@](O)(C)[C@H](NC)[C@@H](O)[C@H]1O[C@@H]1[C@@H](O)[C@H](O[C@H]2[C@@H]([C@@H](O)[C@H](O)[C@@H]([C@@H](C)N)O2)O)[C@@H](N)C[C@H]1N ABCLPPNEPBAKRL-ROQIPNNMSA-N 0.000 abstract 1
- DAKDDLIZULPEFW-UHFFFAOYSA-N 2-[4,6-diamino-3-[[3-amino-6-(aminomethyl)-3,4-dihydro-2h-pyran-2-yl]oxy]-2-hydroxycyclohexyl]oxy-4-(methylamino)oxane-3,5-diol Chemical compound OC1C(NC)C(O)COC1OC1C(O)C(OC2C(CC=C(CN)O2)N)C(N)CC1N DAKDDLIZULPEFW-UHFFFAOYSA-N 0.000 abstract 1
- VIAXDDBFFSKHGA-UHFFFAOYSA-N Antibiotic G52 Natural products CNC1CC(N)C(OC2OCC(C)(O)C(NC)C2O)C(O)C1OC3OC(=CCC3N)CN VIAXDDBFFSKHGA-UHFFFAOYSA-N 0.000 abstract 1
- YQGZDAPJXRYYLX-ZFAMMYHGSA-N Antibiotic JI-20A Chemical compound O1C[C@@](O)(C)[C@H](NC)[C@@H](O)[C@H]1O[C@@H]1[C@@H](O)[C@H](O[C@@H]2[C@@H]([C@@H](O)[C@H](O)[C@@H](CN)O2)N)[C@@H](N)C[C@H]1N YQGZDAPJXRYYLX-ZFAMMYHGSA-N 0.000 abstract 1
- WYJSPPYVEJPMJA-DJWUNRQOSA-N Antibiotic JI-20B Chemical compound O1C[C@@](O)(C)[C@H](NC)[C@@H](O)[C@H]1O[C@@H]1[C@@H](O)[C@H](O[C@@H]2[C@@H]([C@@H](O)[C@H](O)[C@@H]([C@@H](C)N)O2)N)[C@@H](N)C[C@H]1N WYJSPPYVEJPMJA-DJWUNRQOSA-N 0.000 abstract 1
- 229930182566 Gentamicin Natural products 0.000 abstract 1
- HFLKNINDVFJPQT-UHFFFAOYSA-N Gentamicin X2 Natural products O1CC(O)(C)C(NC)C(O)C1OC1C(O)C(OC2C(C(O)C(O)C(CO)O2)N)C(N)CC1N HFLKNINDVFJPQT-UHFFFAOYSA-N 0.000 abstract 1
- HFLKNINDVFJPQT-ZFAMMYHGSA-N Gentamicin X2 Chemical compound O1C[C@@](O)(C)[C@H](NC)[C@@H](O)[C@H]1O[C@@H]1[C@@H](O)[C@H](O[C@@H]2[C@@H]([C@@H](O)[C@H](O)[C@@H](CO)O2)N)[C@@H](N)C[C@H]1N HFLKNINDVFJPQT-ZFAMMYHGSA-N 0.000 abstract 1
- URWAJWIAIPFPJE-UHFFFAOYSA-N Rickamicin Natural products O1CC(O)(C)C(NC)C(O)C1OC1C(O)C(OC2C(CC=C(CN)O2)N)C(N)CC1N URWAJWIAIPFPJE-UHFFFAOYSA-N 0.000 abstract 1
- 229930192786 Sisomicin Natural products 0.000 abstract 1
- XUSXOPRDIDWMFO-UHFFFAOYSA-N Verdamicin Natural products O1CC(O)(C)C(NC)C(O)C1OC1C(O)C(OC2C(CC=C(O2)C(C)N)N)C(N)CC1N XUSXOPRDIDWMFO-UHFFFAOYSA-N 0.000 abstract 1
- 125000003277 amino group Chemical group 0.000 abstract 1
- -1 antibiotic 66-40B Chemical compound 0.000 abstract 1
- ARCVBMPERJRMKB-UHFFFAOYSA-N antibiotic g-52 Chemical compound O1C(CNC)=CCC(N)C1OC1C(O)C(OC2C(C(NC)C(C)(O)CO2)O)C(N)CC1N ARCVBMPERJRMKB-UHFFFAOYSA-N 0.000 abstract 1
- RHRAMPXHWHSKQB-GGEUKFTFSA-N betamicin Chemical compound O1C[C@@](O)(C)[C@H](NC)[C@@H](O)[C@H]1O[C@@H]1[C@@H](O)[C@H](O[C@@H]2[C@@H]([C@@H](O)[C@H](O)[C@@H](CN)O2)O)[C@@H](N)C[C@H]1N RHRAMPXHWHSKQB-GGEUKFTFSA-N 0.000 abstract 1
- 230000003115 biocidal effect Effects 0.000 abstract 1
- 150000001718 carbodiimides Chemical class 0.000 abstract 1
- 150000001875 compounds Chemical class 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- CEAZRRDELHUEMR-UHFFFAOYSA-N gentamicin Chemical class O1C(C(C)NC)CCC(N)C1OC1C(O)C(OC2C(C(NC)C(C)(O)CO2)O)C(N)CC1N CEAZRRDELHUEMR-UHFFFAOYSA-N 0.000 abstract 1
- RHRAMPXHWHSKQB-UHFFFAOYSA-N gentamicin B Natural products O1CC(O)(C)C(NC)C(O)C1OC1C(O)C(OC2C(C(O)C(O)C(CN)O2)O)C(N)CC1N RHRAMPXHWHSKQB-UHFFFAOYSA-N 0.000 abstract 1
- 229930076781 gentamycin C1 Natural products 0.000 abstract 1
- VEGXETMJINRLTH-BOZYPMBZSA-N gentamycin C1a Chemical compound O1C[C@@](O)(C)[C@H](NC)[C@@H](O)[C@H]1O[C@@H]1[C@@H](O)[C@H](O[C@@H]2[C@@H](CC[C@@H](CN)O2)N)[C@@H](N)C[C@H]1N VEGXETMJINRLTH-BOZYPMBZSA-N 0.000 abstract 1
- XUFIWSHGXVLULG-JYDJLPLMSA-N gentamycin C2 Chemical compound O1C[C@@](O)(C)[C@H](NC)[C@@H](O)[C@H]1O[C@H]1[C@@H](O)[C@H](O[C@@H]2[C@@H](CC[C@H](O2)[C@@H](C)N)N)[C@@H](N)C[C@H]1N XUFIWSHGXVLULG-JYDJLPLMSA-N 0.000 abstract 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 abstract 1
- 229960005456 sisomicin Drugs 0.000 abstract 1
- URWAJWIAIPFPJE-YFMIWBNJSA-N sisomycin Chemical compound O1C[C@@](O)(C)[C@H](NC)[C@@H](O)[C@H]1O[C@@H]1[C@@H](O)[C@H](O[C@@H]2[C@@H](CC=C(CN)O2)N)[C@@H](N)C[C@H]1N URWAJWIAIPFPJE-YFMIWBNJSA-N 0.000 abstract 1
- 239000007858 starting material Substances 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
- C07H15/00—Compounds containing hydrocarbon or substituted hydrocarbon radicals directly attached to hetero atoms of saccharide radicals
- C07H15/20—Carbocyclic rings
- C07H15/22—Cyclohexane rings, substituted by nitrogen atoms
- C07H15/222—Cyclohexane rings substituted by at least two nitrogen atoms
- C07H15/226—Cyclohexane rings substituted by at least two nitrogen atoms with at least two saccharide radicals directly attached to the cyclohexane rings
- C07H15/234—Cyclohexane rings substituted by at least two nitrogen atoms with at least two saccharide radicals directly attached to the cyclohexane rings attached to non-adjacent ring carbon atoms of the cyclohexane rings, e.g. kanamycins, tobramycin, nebramycin, gentamicin A2
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Biotechnology (AREA)
- General Health & Medical Sciences (AREA)
- Genetics & Genomics (AREA)
- Molecular Biology (AREA)
- Saccharide Compounds (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US45257174A | 1974-03-19 | 1974-03-19 | |
US05/452,586 US4029882A (en) | 1974-03-19 | 1974-03-19 | Selective acylation of the C-1 amino group of aminoglycoside antibiotics |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1494129A true GB1494129A (en) | 1977-12-07 |
Family
ID=27036813
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2653/75A Expired GB1494129A (en) | 1974-03-19 | 1975-01-21 | Derivatives of diaminocyclitols and methods for their preparation |
Country Status (10)
Country | Link |
---|---|
AR (1) | AR207582A1 (enrdf_load_stackoverflow) |
BG (1) | BG26400A3 (enrdf_load_stackoverflow) |
CH (1) | CH612946A5 (enrdf_load_stackoverflow) |
DE (1) | DE2502296C2 (enrdf_load_stackoverflow) |
FR (1) | FR2264553B1 (enrdf_load_stackoverflow) |
GB (1) | GB1494129A (enrdf_load_stackoverflow) |
HK (1) | HK7681A (enrdf_load_stackoverflow) |
IE (1) | IE40796B1 (enrdf_load_stackoverflow) |
IL (1) | IL46467A (enrdf_load_stackoverflow) |
MY (1) | MY8100350A (enrdf_load_stackoverflow) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010132770A1 (en) * | 2009-05-14 | 2010-11-18 | Achaogen, Inc. | Treatment of klebsiella pneumoniae infections with antibacterial aminoglycoside compounds |
US8383596B2 (en) | 2007-11-21 | 2013-02-26 | Achaogen, Inc. | Antibacterial aminoglycoside analogs |
US8492354B2 (en) | 2009-05-15 | 2013-07-23 | Achaogen, Inc. | Antibacterial aminoglycoside analogs |
US8524689B2 (en) | 2009-05-15 | 2013-09-03 | Achaogen, Inc. | Antibacterial aminoglycoside analogs |
US8524675B2 (en) | 2009-05-15 | 2013-09-03 | Achaogen, Inc. | Antibacterial aminoglycoside analogs |
US8653042B2 (en) | 2009-05-15 | 2014-02-18 | Achaogen, Inc. | Antibacterial aminoglycoside analogs |
US8658606B2 (en) | 2009-05-15 | 2014-02-25 | Achaogen, Inc. | Antibacterial aminoglycoside analogs |
US9073958B2 (en) | 2006-04-03 | 2015-07-07 | Technion Research & Development Foundation Limited | Aminoglycosides and uses thereof in the treatment of genetic disorders |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4136254A (en) * | 1976-06-17 | 1979-01-23 | Schering Corporation | Process of selectively blocking amino functions in aminoglycosides using transition metal salts and intermediates used thereby |
DE2753769A1 (de) * | 1977-12-02 | 1979-06-13 | Bayer Ag | 1-n-4,6-di-o-(aminoglykosyl)-1,3- diamino-cyclitol-derivate, verfahren zu ihrer herstellung sowie ihre verwendung |
DE2921973A1 (de) * | 1979-05-30 | 1980-12-11 | Bayer Ag | Sisomicin-derivate, verfahren zu ihrer herstellung und ihre verwendung als arzneimittel |
DE3101376A1 (de) * | 1981-01-17 | 1982-09-02 | Bayer Ag, 5090 Leverkusen | Sisomicin-derivate, verfahren zu ihrer herstellung und ihre verwendung als arzneimittel |
-
1975
- 1975-01-01 AR AR257371A patent/AR207582A1/es active
- 1975-01-21 GB GB2653/75A patent/GB1494129A/en not_active Expired
- 1975-01-21 FR FR7501799A patent/FR2264553B1/fr not_active Expired
- 1975-01-21 DE DE2502296A patent/DE2502296C2/de not_active Expired
- 1975-01-21 IL IL46467A patent/IL46467A/xx unknown
- 1975-01-21 IE IE115/75A patent/IE40796B1/xx unknown
- 1975-01-22 CH CH77275A patent/CH612946A5/xx not_active IP Right Cessation
- 1975-01-24 BG BG028804A patent/BG26400A3/xx unknown
-
1981
- 1981-03-12 HK HK76/81A patent/HK7681A/xx unknown
- 1981-12-30 MY MY350/81A patent/MY8100350A/xx unknown
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10159689B2 (en) | 2006-04-03 | 2018-12-25 | Technion Research & Development Foundation Limited | Aminoglycosides and uses thereof in the treatment of genetic disorders |
US9821001B2 (en) | 2006-04-03 | 2017-11-21 | Technion Research & Development Foundation Limited | Aminoglycosides and uses thereof in the treatment of genetic disorders |
US9073958B2 (en) | 2006-04-03 | 2015-07-07 | Technion Research & Development Foundation Limited | Aminoglycosides and uses thereof in the treatment of genetic disorders |
US9266919B2 (en) | 2007-11-21 | 2016-02-23 | Achaogen, Inc. | Antibacterial aminoglycoside analogs |
US8383596B2 (en) | 2007-11-21 | 2013-02-26 | Achaogen, Inc. | Antibacterial aminoglycoside analogs |
US11117915B2 (en) | 2007-11-21 | 2021-09-14 | Cipla USA, Inc. | Antibacterial aminoglycoside analogs |
US9688711B2 (en) | 2007-11-21 | 2017-06-27 | Achaogen, Inc. | Antibacterial aminoglycoside analogs |
US8822424B2 (en) | 2007-11-21 | 2014-09-02 | Achaogen, Inc. | Antibacterial aminoglycoside analogs |
WO2010132770A1 (en) * | 2009-05-14 | 2010-11-18 | Achaogen, Inc. | Treatment of klebsiella pneumoniae infections with antibacterial aminoglycoside compounds |
US8524689B2 (en) | 2009-05-15 | 2013-09-03 | Achaogen, Inc. | Antibacterial aminoglycoside analogs |
US8658606B2 (en) | 2009-05-15 | 2014-02-25 | Achaogen, Inc. | Antibacterial aminoglycoside analogs |
US8653042B2 (en) | 2009-05-15 | 2014-02-18 | Achaogen, Inc. | Antibacterial aminoglycoside analogs |
US8524675B2 (en) | 2009-05-15 | 2013-09-03 | Achaogen, Inc. | Antibacterial aminoglycoside analogs |
USRE47741E1 (en) | 2009-05-15 | 2019-11-26 | Achaogen, Inc. | Antibacterial aminoglycoside analogs |
US8492354B2 (en) | 2009-05-15 | 2013-07-23 | Achaogen, Inc. | Antibacterial aminoglycoside analogs |
Also Published As
Publication number | Publication date |
---|---|
AU7747775A (en) | 1976-07-22 |
IE40796B1 (en) | 1979-08-15 |
MY8100350A (en) | 1981-12-31 |
FR2264553B1 (enrdf_load_stackoverflow) | 1978-12-01 |
IL46467A (en) | 1978-10-31 |
CH612946A5 (en) | 1979-08-31 |
DE2502296A1 (de) | 1975-09-25 |
HK7681A (en) | 1981-03-20 |
BG26400A3 (bg) | 1979-03-15 |
DE2502296C2 (de) | 1983-09-22 |
IL46467A0 (en) | 1975-04-25 |
AR207582A1 (es) | 1976-10-15 |
IE40796L (en) | 1975-09-19 |
FR2264553A1 (enrdf_load_stackoverflow) | 1975-10-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB1494129A (en) | Derivatives of diaminocyclitols and methods for their preparation | |
HK484A (en) | Process of selectively blocking amino groups | |
Wright | Synthesis of 1-N-ethylsisomicin: a broad-spectrum semisynthetic aminoglycoside antibiotic | |
FR2309234B1 (enrdf_load_stackoverflow) | ||
ES467964A1 (es) | Procedimiento para la obtencion de derivados de los pseudo- trisacaridos. | |
GB1355260A (en) | Gentamicin antibiotics | |
ES463684A1 (es) | Un procedimiento para preparar nuevos derivados de aminogli-cosido. | |
DE2350169B2 (de) | 11.12.72 Japan 123482-72 23.01.73 Japan 9146-73 1-N- [(S)-2-Hydroxy-4-amino-butyryl] -neamin-Derivate, Verfahren zu ihrer Herstellung und solche Derivate enthaltende Arzneimittel | |
ES426998A1 (es) | Procedimiento para la obtencion de aminoglicosidos de 2 - deoxi - estreptamina. | |
SE7702066L (sv) | Forfarande for framstellning av antibakteriella aminoglykosidderivat, mellanprodukter for anvendning vid detta forfarande och sett att framstella nemda mellanprodukt | |
CH608022A5 (en) | Process for the preparation of halogenated aminoglycoside antibiotics and the use thereof | |
JPS55160791A (en) | Sisomicin derivative | |
JPS5540621A (en) | Novel aminoglycoside derivative | |
SE7513330L (sv) | Pseudotrisackarider och forfarande for framstellning derav | |
YU39743B (en) | Process for preparing nitrosourea derivatives | |
GB874028A (en) | Derivatives of antibiotics having a basic reaction, and a process for their preparation | |
ES433990A1 (es) | Procedimiento para la preparacion de derivados de diaminoci-clitoles. | |
JPS55329A (en) | Novel xk-62-4 derivative | |
GB1424114A (en) | Antibiotic g-52 and method for the production thereof | |
GB1500218A (en) | Derivative of antibiotic xk-62-2 and method of production thereof | |
GB1475481A (en) | 1-n-alpha-hydroxy-omega-aminoalkanoyl-6-n-methyl-3,4-dideoxy kanamycin b and the production thereof | |
ES449457A1 (es) | Procedimiento para la preparacion de nuevos pseudotrisacari-dos. | |
NZ179050A (en) | Antibacterial 2-deoxystreptamine amino-glycosides (2-hydroxy-w-aminoalkyl derivatiues): and pharmaceutical compositions | |
FR2405266A1 (fr) | Nouveaux pseudotrisaccharides, et applications pharmaceutiques de ceux-ci | |
GB1523634A (en) | Aminoglycoside antibiotics and a process for their production |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee | ||
704A | Declaration that licence is not available as of right for an excepted use (par. 4a/1977) | ||
PE20 | Patent expired after termination of 20 years |
Effective date: 19950120 |