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Patent US3433784A successfully refreshed from Google Patents.
US3433784A
Expired / Lapsed
US
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Penicillins substituted with heterocyclic groups
Assignee: Beecham Group PLC
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Filing: 1967-04-19
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Granted: 1969-03-18
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Expires: 1987-04-19
Abstract
No abstract record available.
Inventors
- 👤 Anthony Alfred Walter Long
- 👤 John Herbert Charles Nayler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:51
CPC Classifications
C; C07; C07D; C07D499/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3252851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-17 | 1972-09-16 | 1973-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-17 | 1976-09-16 | 1977-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-17 | 1980-09-16 | 1981-03-18 | $7700.00 | Window Closed / Lapsed |