Patent US2941995A successfully refreshed from Google Patents.
US2941995A
Expired / Lapsed
US
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Recovery of solid 6-aminopenicillanic acid
Assignee: Beecham Research Laboratories Ltd
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Filing: 1958-07-22
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Granted: 1960-06-21
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Expires: 1978-07-22
Abstract
No abstract record available.
Inventors
- 👤 Doyle Frank Peter
- 👤 Nayler John Herbert Charles
- 👤 Rolinson George Newbolt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:27
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/36; F16F1/40; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/911; Y10S435/933; Y10S435/935
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
THE PROCESS FOR THE RECOVERY OF SOLID 6-AMINOPENICILLANIC ACID WHICH COMPRISES ADJUSTING THE PH OF A CONCENTRATED AQUEOUS SOLUTION OF 6-AMINOPENICILLANIC ACID TO ABOUT 4,3-5.0 TP PRECIPITATE SOLID 6-AMINOPENICILLANIC ACID AND RECOVERING SAID PRECIPITATED SOLID 6-AMINOPENICILLANIC ACID.
Claim 2
Dependent Claim
37 words
THE PROCESS FOR THE RECOVERY OF SOLID 6-AMINOPENICILLANIC ACID WHICH COMPRISES ADJUSTING THE PH OF A CONCENTRATED AQUEOUS SOLUTION OF 6-AMINOPENICILLANIC ACID TO ABOUT 4,3-5.0 TP PRECIPITATE SOLID 6-AMINOPENICILLANIC ACID AND RECOVERING SAID PRECIPITATED SOLID 6-AMINOPENICILLANIC ACID.
References Cited (Backward Citations)
US2717892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-21 | 1963-12-21 | 1964-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-21 | 1967-12-21 | 1968-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-21 | 1971-12-21 | 1972-06-21 | $7700.00 | Window Closed / Lapsed |