US2930736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized trypsin compositions containing partially hydrolyzed gelatin and method of making
Assignee: National Drug Co
•
Filing: 1957-01-07
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Granted: 1960-03-29
•
Expires: 1977-01-07
Abstract
No abstract record available.
Inventors
- 👤 Miller J Sullivan
- 👤 Gustav J Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:22
CPC Classifications
C; C12; C12N; C12N9/00; C12N9/96
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
38 words
A COMPOSITION ESSENTIALLY COMPRISING AN AQUEOUS SOLUTION OF TRYPSIN AND PERFORMED STERILE, PYROGEN-FREE, NON-ANTIGENIC GELATIN, THE LATTER PARTIALLY HYDROLYZED BY HEATING IN A DILUTE ACID FOR 2-5 HOURS AT 100*C., SAID COMPOSITION HAVING A PH OF ABOUT 3.2-4.8.
Claim 2
Dependent Claim
38 words
A COMPOSITION ESSENTIALLY COMPRISING AN AQUEOUS SOLUTION OF TRYPSIN AND PERFORMED STERILE, PYROGEN-FREE, NON-ANTIGENIC GELATIN, THE LATTER PARTIALLY HYDROLYZED BY HEATING IN A DILUTE ACID FOR 2-5 HOURS AT 100*C., SAID COMPOSITION HAVING A PH OF ABOUT 3.2-4.8.
Claim 3
Independent Claim
46 words
A METHOD OF STABILIZING AN AQUEOUS TRYPSIN COMPOSITION AGAINST SELF-DIGESTION COMPRISING INCORPORATING INTO THE COMPOSITION A PREFORMED DENATURED GELATIN WHICH HAS BEEN PARTIALLY HYDROLYZED BY HEATING AT 80*-120*C. FOR 1-5 HOURS IN THE PRESENCE OF A DILUTE ACID AND ADJUSTED TO A PH OF ABOUT 3.2-4.8.
Claim 4
Independent Claim
46 words
A METHOD OF STABILIZING AN AQUEOUS TRYPSIN COMPOSITION AGAINST SELF-DIGESTION COMPRISING INCORPORATING INTO THE COMPOSITION A PREFORMED DENATURED GELATIN WHICH HAS BEEN PARTIALLY HYDROLYZED BY HEATING AT 80*-120*C. FOR 1-5 HOURS IN THE PRESENCE OF A DILUTE ACID AND ADJUSTED TO A PH OF ABOUT 3.2-4.8.
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) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |