Patent US3453263A successfully refreshed from Google Patents.
US3453263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing penicillins
Assignee: Wyeth LLC
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Filing: 1965-03-01
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Granted: 1969-07-01
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Expires: 1985-03-01
Abstract
No abstract record available.
Inventors
- 👤 William Dvonch
- 👤 Harvey E Alburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:40
CPC Classifications
C; C07; C07D; C07D499/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
THE PROCESS FOR PRODUCING 6-(A-AMINOACYLAMINO) PENICILLANIC ACID COMPOUNDS WHICH COMPRISES REACTING, IN AN AQUEOUS ACIDIC MEDIUM AT A PH OF FROM ABOUT 2.0 TO ABOUT 7.0, 6-AMINOPENICILLANIC ACID WITH AN N-CHLOROFORMYL DERIVATIVE HAVING THE FORMULA:
Claim 2
Dependent Claim
35 words
THE PROCESS FOR PRODUCING 6-(A-AMINOACYLAMINO) PENICILLANIC ACID COMPOUNDS WHICH COMPRISES REACTING, IN AN AQUEOUS ACIDIC MEDIUM AT A PH OF FROM ABOUT 2.0 TO ABOUT 7.0, 6-AMINOPENICILLANIC ACID WITH AN N-CHLOROFORMYL DERIVATIVE HAVING THE FORMULA:
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) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |