US4305958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cysteine derivatives
Assignee: Santen Pharmaceutical Co Ltd
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Filing: 1977-02-24
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Granted: 1981-12-15
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Expires: 1997-02-24
Abstract
Abstract This invention relates to the compounds: N-(mercaptoacy)-cysteine represented by the following formula wherein Z is selected from the group consisting of CH 3 --CH<, (CH 3 ) 2 C<, (CH 2 ) 2 < and CH 2 <, acting as agents for the liquefaction of sputum, intermediate therefor and a process for manufacture thereof. ##STR1##
Inventors
- 👤 Tadashi Fujita
- 👤 Masayuki Oya
- 👤 Hideo Takashina
- 👤 Tadashi Iso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:47
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/185; A61K31/19; A61K31/195; A61P; A61P11/00; A61P11/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
1 words
N-(2-mercaptoisobutyryl)-cysteine.
Claim 2
Dependent Claim
1 words
N-(2-mercaptoisobutyryl)-cysteine.
Claim 3
Dependent Claim
1 words
N-(2-mercaptopropionyl)-cysteine.
Claim 4
Dependent Claim
1 words
N-(2-mercaptopropionyl)-cysteine.
Claim 5
Dependent Claim
22 words
A composition for the liquefaction of sputum containing an effective amount of the N-(mercaptoacyl)-cysteine having the formula ##STR3## and a medicinal carrier.
Claim 6
Dependent Claim
22 words
A composition for the liquefaction of sputum containing an effective amount of the N-(mercaptoacyl)-cysteine having the formula ##STR3## and a medicinal carrier.
Claim 7
Dependent Claim
22 words
A composition for the liquefaction of sputum containing an effective amount of the N-(mercaptoacyl)-cysteine having the formula ##STR4## and a medicinal carrier.
Claim 8
Dependent Claim
22 words
A composition for the liquefaction of sputum containing an effective amount of the N-(mercaptoacyl)-cysteine having the formula ##STR4## and a medicinal carrier.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-14 | 1985-06-15 | 1985-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-14 | 1989-06-15 | 1989-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-14 | 1993-06-15 | 1993-12-15 | $7700.00 | Window Closed / Lapsed |