US2827419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acylated gelatins and their preparations
Assignee: CHARLES B KNOX GELATINE Co Inc
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Filing: 1954-09-24
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Granted: 1958-03-18
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Expires: 1974-09-24
Abstract
No abstract record available.
Inventors
- 👤 Tourtellotte Dee
- 👤 Henry E Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:31
CPC Classifications
C; C07; C07K; C07K14/00; C07K14/435; C07K14/78
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A GELATIN DERIVATIVE CONSISTING OF THAT FRACTION OF THE PRODUCTS RESULTING FROM REACTING GELATIN HAVING A NUMBER AVERAGE MOLECULAR WEIGHT WITHIN THE RANGE 15,000 TO 36,000 WITH A POLYCARBOXYLIC ACID COMPOUND SELECTED FROM THE GROUP CONSISTING OF SUCCINIC, CITRACONIC, ITACONIC, ACONITIC AND MALEIC ANHYDRIDE AND SUCCINYL AND FUMARYL CHLORIDE IN AN AQUEOUS MEDIUM ADJUSTED TO A PH OF 6 TO 10 AND PRECIPITATING AS THE COAGULUM FROM THE REACTION MIXTURE UPON ACIDIFYING SAID MIXTURE OF A PH RANGE FROM ABOUT THE ISOELECTRIC POINT OF SAID FRACTION TO 2 PH UNITS THEREBELOW.
Claim 2
Dependent Claim
91 words
A GELATIN DERIVATIVE CONSISTING OF THAT FRACTION OF THE PRODUCTS RESULTING FROM REACTING GELATIN HAVING A NUMBER AVERAGE MOLECULAR WEIGHT WITHIN THE RANGE 15,000 TO 36,000 WITH A POLYCARBOXYLIC ACID COMPOUND SELECTED FROM THE GROUP CONSISTING OF SUCCINIC, CITRACONIC, ITACONIC, ACONITIC AND MALEIC ANHYDRIDE AND SUCCINYL AND FUMARYL CHLORIDE IN AN AQUEOUS MEDIUM ADJUSTED TO A PH OF 6 TO 10 AND PRECIPITATING AS THE COAGULUM FROM THE REACTION MIXTURE UPON ACIDIFYING SAID MIXTURE OF A PH RANGE FROM ABOUT THE ISOELECTRIC POINT OF SAID FRACTION TO 2 PH UNITS THEREBELOW.
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) | 1961-03-17 | 1961-09-16 | 1962-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-17 | 1965-09-16 | 1966-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-17 | 1969-09-16 | 1970-03-18 | $7700.00 | Window Closed / Lapsed |