Patent US3939150A successfully refreshed from Google Patents.
US3939150A
Expired / Lapsed
US
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Penicillin derivatives
Assignee: Astellas Pharma Inc
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Filing: 1974-10-15
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Granted: 1976-02-17
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Expires: 1994-10-15
Abstract
Abstract The penicillin derivatives represented by the formula WHEREIN RING A represents a 5- or 6-membered single or fused ring which may contain one or more nitrogen atoms, an oxygen atom, or a sulfur atom; R1, R2, and R3, which may be the same or different, each represents a hydrogen atom, a hydroxy group, a lower alkyl group, a nitro group, a halogen atom, or an oxo group; and B represents a p-hydroxyphenyl group or a 1,4-cyclohexadien -1-yl group, and their nontoxic pharmaceutically acceptable salts.
Inventors
- 👤 Masuo Murakami
- 👤 Ichiro Isaka
- 👤 Khozi Nakano
- 👤 Isao Souzu
- 👤 Akio Koda
- 👤 Teruaki Ozasa
- 👤 Teruya Kashiwagi
- 👤 Yukiyasu Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:52
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/78; C07D499/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
α-(4-Oxo-4H-thiopyran-3-carboxamido)-p-hydroxybenzylpenicillin and its pharmaceutically acceptable acid addition salts.
Claim 2
Dependent Claim
8 words
α-(4-Oxo-4H-thiopyran-3-carboxamido)-p-hydroxybenzylpenicillin and its pharmaceutically acceptable acid addition salts.
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) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |