Patent US3945995A successfully refreshed from Google Patents.
US3945995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
D-α-(4-hydroxypyridine-3-carbonamido)-p-hydroxyphenylacetamidopenicillanic acid
Assignee: Sumitomo Chemical Co Ltd
•
Filing: 1974-04-05
•
Granted: 1976-03-23
•
Expires: 1994-04-05
Abstract
Abstract Penicillins of the formula: ##SPC1## Wherein R is an unsubstituted phenyl group or a substituted phenyl group having one or more hydroxyl groups or a cyclohexadienyl group and A represents a monocyclic or polycyclic nitrogen-containing heterocyclic aromatic ring, which are useful as antimicrobial agents having a broad antimicrobial spectrum against gram-positive and gram-negative bacteria including Pseudomonas and can be produced advantageously from the phenacyl ester of 6-aminopenicillanic acid through a series of steps.
Inventors
- 👤 Hirotada Yamada
- 👤 Hisao Tobiki
- 👤 Iwao Nakatsuka
- 👤 Norithiko Tanno
- 👤 Kozo Shimago
- 👤 Takenari Nakagome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:51
CPC Classifications
C; C07; C07D; C07D471/00; C07D471/02; C07D471/04; C07D499/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
2 words
D-α-(4-Hydroxypyridine-3-carbonamido)-p-hydroxyphenylacetamidopenicillanic acid.
Claim 2
Dependent Claim
2 words
D-α-(4-Hydroxypyridine-3-carbonamido)-p-hydroxyphenylacetamidopenicillanic acid.
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) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |