US2725336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation containing modified procaine penicillin crystals and process for preparing such crystals
Assignee: Pfizer Inc
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Filing: 1950-11-06
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Granted: 1955-11-29
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Expires: 1970-11-06
Abstract
No abstract record available.
Inventors
- 👤 Oscar R Sumner
- 👤 Thomas C Grenfell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:53
CPC Classifications
C; C07; C07D; C07D499/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
THE PROCESS FOR PREPARING PROCAINE PENICILLIN CRYSTALS IN MODIFIED FROM, WHICH COMPRISES REACTING A WATERSOLUBLE PROCAINE SALT WITH A WATER-SOLUBLE SALT OF PENICILLIN IN AN AQUEOUS SOLUTION CONTAINING A SMALL AMOUNT OF A VEGETABLE GUM SELECTED FROM THE CLASS CONSISTING OF WATERSOLUBLE CARBOXYMETHYL CELLULOSE, PECTIN, ACAIA, GUM TRAGACANTH AND AGAR.
Claim 2
Dependent Claim
50 words
THE PROCESS FOR PREPARING PROCAINE PENICILLIN CRYSTALS IN MODIFIED FROM, WHICH COMPRISES REACTING A WATERSOLUBLE PROCAINE SALT WITH A WATER-SOLUBLE SALT OF PENICILLIN IN AN AQUEOUS SOLUTION CONTAINING A SMALL AMOUNT OF A VEGETABLE GUM SELECTED FROM THE CLASS CONSISTING OF WATERSOLUBLE CARBOXYMETHYL CELLULOSE, PECTIN, ACAIA, GUM TRAGACANTH AND AGAR.
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) | 1958-11-28 | 1959-05-30 | 1959-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-28 | 1963-05-30 | 1963-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-28 | 1967-05-30 | 1967-11-29 | $7700.00 | Window Closed / Lapsed |