US3157524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of collagen sponge
Assignee: Ethicon Inc
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Filing: 1962-03-13
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Granted: 1964-11-17
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Expires: 1982-03-13
Abstract
No abstract record available.
Inventors
- 👤 Artandi Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:05
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/425; C08J2389/00; C08J2389/04; C08J2389/06; Y; Y10; Y10S; Y10S128/00; Y10S128/08; Y10S530/00; Y10S530/827; Y10S530/84
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
69 words
A METHOD OF MAKING A COLLAGEN SPONGE HAVING INTERCONNECTED PORES THROUGHOUT, WHICH COMPRISES FREEZING A MASS OF ACID SWOLLEN COLLAGEN FIBRILS CONTAINIG 0.5% TO 4.0% BY WEIGHT COLLAGEN FIBRILS, IMMENSING THE FORZEN MASS INTO A WATER MISCIBLE ORGNAIC SOLVENT CONTAINING SUFFICIENT BASE TO NEUTRALIZE THE ACID PRESENT IN SAID DISPERSION WHEREBY THE COLLAGEN FIBERS ARE DEHYDRATED AND COAGULATED, AND DRYING THE RESULTING COLLAGEN MASS TO FORM A COLLAGEN SPONGE.
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) | 1967-11-17 | 1968-05-18 | 1968-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-17 | 1972-05-18 | 1972-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-17 | 1976-05-18 | 1976-11-17 | $7700.00 | Window Closed / Lapsed |