US3782977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing collagen compositions
Assignee: Union Carbide Corp
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Filing: 1971-09-01
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Granted: 1974-01-01
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Expires: 1991-09-01
Abstract
Abstract A METHOD FOR PREPARING HOMOGENEOUS FORMABLE COLLAGEN COMPOSITIONS HAVING NON-COLLAGENOUS FIBERS UNIFORMLY DISPERSED THEREIN, PARTICULARLY COMPOSITIONS HAVING A COLLAGEN SOLIDS CONTENT OF AT LEAST ABOUT 6% BY WEIGHT WHICH INCLUDES THE STEPS OF (A) PREPARING A VARIOUS AQUEOUS DISPERSION OF NON-COLLAGENOUS FIBERS CONTAINING A VISCOSITY CONTROL AGENT, (B) PREPARING A COMMINUTED PRESWOLLEN COLLAGEN MASS, AND (C) THOROUGLY MIXING SAID VISCOUS NON-COLLAGENOUS FIBER DISPERSION AND SAID PRESWOLLEN COLLAGEN MASS WHILE MAINTAINING THE TEMPERATURE OF THE ADMIXTURE BELOW ABOUT 35*C.
Inventors
- 👤 W Henderson
- 👤 C Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:27
CPC Classifications
A; A22; A22C; A22C13/00; A22C13/0013; A22C13/0016
Claims Analysis
Total Claims: 0
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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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |