US2585546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of high viscosity hyaluronic acid
Assignee: GD Searle LLC
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Filing: 1948-02-03
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Granted: 1952-02-12
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Expires: 1968-02-03
Abstract
No abstract record available.
Inventors
- 👤 Hadidian Zareh
- 👤 Norman W Pirie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:08
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/006; C08B37/0063; C08B37/0072
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
56 words
THE PROCESS OF PRODUCING HIGH VISCOSITY HYALURONIC ACID WHICH COMPRISES EXTRACTING ACETONE-WASHED UMBILICAL CORDS WITH SALT SOLUTION, ACIDIFYING THE RESULTING EXTRACT, REMOVING THE CLOT SO FORMED, PRECIPITATING PROTEIN WITH AN INERT PROTEIN-PRECIPITANT, REMOVING THE PRECIPITATE, AND PRECIPITATING HYALURONIC ACID WITH A PRECIPITANT OF THE GROUP CONSISTING OF (A) PYRIDINE AND AMMONIUM SULFATE AND (B) AMMONIUM SULFATE.
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) | 1955-02-11 | 1955-08-13 | 1956-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-11 | 1959-08-13 | 1960-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-11 | 1963-08-13 | 1964-02-12 | $7700.00 | Window Closed / Lapsed |