Patent US3173911A successfully refreshed from Google Patents.
US3173911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of penicillin esters
Assignee: Smith Kline & French Laboratories Ltd
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Filing: 1961-10-30
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Granted: 1965-03-16
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Expires: 1981-10-30
Abstract
No abstract record available.
Inventors
- 👤 John R E Hoover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:51
CPC Classifications
C; C07; C07D; C07D499/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
THE PROCESS OF PREPARING BENZYL ESTERS OF PENICILLINS WHICH COMPRISES TREATING A PENICILLIN OF THE FORMULA:
Claim 2
Dependent Claim
16 words
THE PROCESS OF PREPARING BENZYL ESTERS OF PENICILLINS WHICH COMPRISES TREATING A PENICILLIN OF THE FORMULA:
References Cited (Backward Citations)
US2754297A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-15 | 1968-09-14 | 1969-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-15 | 1972-09-14 | 1973-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-15 | 1976-09-14 | 1977-03-16 | $7700.00 | Window Closed / Lapsed |