Patent US3647783A successfully refreshed from Google Patents.
US3647783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
(2-substituted - 5 - oxo-cyclopent-1-enyl) esters of alpha-carboxyarylmethyl penicillins
Assignee: Pfizer Inc
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Filing: 1969-08-04
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Granted: 1972-03-07
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Expires: 1989-08-04
Abstract
Abstract A SERIES OF A-(CARBO-(1-(2-SUBSTITUTED-5-OXO-CYCLOPENT1-ENYLOXY)(ARYLMETHYL PENICILLINS WHEREIN THE SUBSTITUENT IS LOWER ALKLY OR BENZYL AND METHODS FOR THEIR PREPARATION ARE DESCRIBED.
Inventors
- 👤 Donald K Piric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:46
CPC Classifications
C; C07; C07D; C07D499/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |