US3152203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of collagen films
Assignee: Dow Chemical Co
•
Filing: 1961-05-31
•
Granted: 1964-10-06
•
Expires: 1981-05-31
Abstract
No abstract record available.
Inventors
- 👤 Earl T Dumitru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:21
CPC Classifications
C; C08; C08L; C08L89/00; C08L89/04; C08L89/06; Y; Y10; Y10S; Y10S530/00; Y10S530/827; Y10S530/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A METHOD FOR THE PREPARATION OF SHEET FORM COLLAGEN, WHICH METHOD COMPRISES DEPOSITING A LAYER OF AN AQUEOUS 0.2 TO 0.5 WEIGHT PERCENT SOLUTIN OF COLLAGEN DERIVED FROM TATS ON A SUBSTRATE COMPRISING A SMOOTH SURFACE OF A HYDROPHOBIC, RESINOUS MATERIAL, SELECTED FROM THE GROUP CONSISTIG OF POLYSTYRENE, POLYETHYLENE, POLYPROPYLENE, POLYTETRAFLUOROETHYLENE AND RUBBER, DRYING THE LAYER TO A CONTINUOUS FILM AND REMOVING SAID DRIED FILM FROM SAID SUBSTRATE.
Claim 2
Independent Claim
68 words
A METHOD FOR THE PREPARATION OF SHEET FORM COLLAGEN, WHICH METHOD COMPRISES DEPOSITING A LAYER OF AN AQUEOUS 0.2 TO 0.5 WEIGHT PERCENT SOLUTIN OF COLLAGEN DERIVED FROM TATS ON A SUBSTRATE COMPRISING A SMOOTH SURFACE OF A HYDROPHOBIC, RESINOUS MATERIAL, SELECTED FROM THE GROUP CONSISTIG OF POLYSTYRENE, POLYETHYLENE, POLYPROPYLENE, POLYTETRAFLUOROETHYLENE AND RUBBER, DRYING THE LAYER TO A CONTINUOUS FILM AND REMOVING SAID DRIED FILM FROM SAID SUBSTRATE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-10-06 | 1968-04-06 | 1968-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-06 | 1972-04-06 | 1972-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-06 | 1976-04-06 | 1976-10-06 | $7700.00 | Window Closed / Lapsed |