Patent US2583096A successfully refreshed from Google Patents.
US2583096A
Expired / Lapsed
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Process for the production of high viscosity hyaluronic acid
Assignee: GD Searle LLC
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Filing: 1949-01-15
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Granted: 1952-01-22
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Expires: 1969-01-15
Abstract
No abstract record available.
Inventors
- 👤 Hadidian Zareh
- 👤 Norman W Pirie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:54
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/006; C08B37/0063; C08B37/0072
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
THE PROCESS OF RECOVERING HYALURONIC ACID FROM A MIXTURE OF HYALURONIC ACID AND PROTEIN WHICH COMPRISES INCUBATING SAID MIXTURE WITH A PROTEOLYTIC ENZYME AT 35-40* C., PRECIPITATING THE HYALURONIC ACID WITH ALCOHOLIC HYDROCHLORIC ACID FOLLOWED BY AMMONIUM SULFATE AND REMOVING THE IONIC MATERIAL BY DIALYSIS.
Claim 2
Dependent Claim
45 words
THE PROCESS OF RECOVERING HYALURONIC ACID FROM A MIXTURE OF HYALURONIC ACID AND PROTEIN WHICH COMPRISES INCUBATING SAID MIXTURE WITH A PROTEOLYTIC ENZYME AT 35-40* C., PRECIPITATING THE HYALURONIC ACID WITH ALCOHOLIC HYDROCHLORIC ACID FOLLOWED BY AMMONIUM SULFATE AND REMOVING THE IONIC MATERIAL BY DIALYSIS.
References Cited (Backward Citations)
US2097481A
Cited
US2410084A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-21 | 1955-07-23 | 1956-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-21 | 1959-07-23 | 1960-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-21 | 1963-07-23 | 1964-01-22 | $7700.00 | Window Closed / Lapsed |