Patent US1961170A successfully refreshed from Google Patents.
US2973302A
Expired / Lapsed
US
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Purification of collagen
Assignee: Ethicon Inc
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Filing: 1958-02-05
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Granted: 1961-02-28
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Expires: 1978-02-05
Abstract
No abstract record available.
Inventors
- 👤 Bloch Alfred
- 👤 Irving B Oneson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:25
CPC Classifications
D; D01; D01C; D01C3/00; D01F; D01F4/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
IN A PROCESS FOR PREAPRING A DISPERSION OF SWOLLEN COLLAGEN FIBERS IN A AQUEOUS ACID SOLVENT, THE IMPROVEMENT COMPRISING: TREATING FINELY DIVIDED CONNECTIVE TISSUE WHICH IS SUBSTANTIALLY FREE FROM FAT AND MUSCLE TISSUE WITH A SOLUTION OF AN ELASTASE AT A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 5* C. TO ABOUT 45* C. THE PH OF THE TREATING SOLUTION BEING WITHIN THE RANGE OF FROM ABOUT 5 TO ABOUT 9, WHEREBY ALL ELASTIN IS REMOVED WITHOUT ALTERING THE COLLAGEN PRESENT IN SAID CONNECTIVE TISSUE AND REMOVING THE ELASTASE ADSORBED ON THE RESIDUAL COLLAGEN FIBERS TO AVOID DESTRUCTION OF SAID COLLAGEN FIBERS.
Claim 2
Dependent Claim
102 words
IN A PROCESS FOR PREAPRING A DISPERSION OF SWOLLEN COLLAGEN FIBERS IN A AQUEOUS ACID SOLVENT, THE IMPROVEMENT COMPRISING: TREATING FINELY DIVIDED CONNECTIVE TISSUE WHICH IS SUBSTANTIALLY FREE FROM FAT AND MUSCLE TISSUE WITH A SOLUTION OF AN ELASTASE AT A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 5* C. TO ABOUT 45* C. THE PH OF THE TREATING SOLUTION BEING WITHIN THE RANGE OF FROM ABOUT 5 TO ABOUT 9, WHEREBY ALL ELASTIN IS REMOVED WITHOUT ALTERING THE COLLAGEN PRESENT IN SAID CONNECTIVE TISSUE AND REMOVING THE ELASTASE ADSORBED ON THE RESIDUAL COLLAGEN FIBERS TO AVOID DESTRUCTION OF SAID COLLAGEN FIBERS.
References Cited (Backward Citations)
US2369256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-28 | 1964-08-29 | 1965-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-28 | 1968-08-29 | 1969-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-28 | 1972-08-29 | 1973-02-28 | $7700.00 | Window Closed / Lapsed |