US3034852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solubilization of insoluble collagen fibers and reconstitution thereof
Assignee: JAPAN LEATHER Manufacturing Co Ltd
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Filing: 1960-04-01
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Granted: 1962-05-15
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Expires: 1980-04-01
Abstract
No abstract record available.
Inventors
- 👤 Nishihara Tomio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:29
CPC Classifications
D; D01; D01F; D01F4/00; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/32; A61L15/325; C; C09; C09H; C09H1/00; C09H3/00; Y; Y10; Y10S; Y10S128/00; Y10S128/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A PROCESS FOR MAKING A SOLUTION OF UNDENATURED COLLAGEN FROM A COLLAGEN WHICH IS INSOLUBLE IN DILUTE ACID, ALKALI, AND NEUTRAL SALT SOLUTIONS, WHICH COMPRISES TREATING SAID INSOLUBLE COLLAGEN WITH A HYDROLYTIC ENZYME SELECTED FROM THE GROUP CONSISTING OF TRYPSIN AND PEPSIN AT A TEMPERATURE BELOW 60*C. AND EXTRACTING THE COLLAGEN WITH A DILUTE ACID OF ABOUT PH 1 TO ABOUT PH 4 AT A TEMPERATURE BELOW 37*C., WHEREBY A COLLAGEN SOLUTION IS PRODUCED.
Claim 2
Dependent Claim
74 words
A PROCESS FOR MAKING A SOLUTION OF UNDENATURED COLLAGEN FROM A COLLAGEN WHICH IS INSOLUBLE IN DILUTE ACID, ALKALI, AND NEUTRAL SALT SOLUTIONS, WHICH COMPRISES TREATING SAID INSOLUBLE COLLAGEN WITH A HYDROLYTIC ENZYME SELECTED FROM THE GROUP CONSISTING OF TRYPSIN AND PEPSIN AT A TEMPERATURE BELOW 60*C. AND EXTRACTING THE COLLAGEN WITH A DILUTE ACID OF ABOUT PH 1 TO ABOUT PH 4 AT A TEMPERATURE BELOW 37*C., WHEREBY A COLLAGEN SOLUTION IS PRODUCED.
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) | 1965-05-14 | 1965-11-13 | 1966-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-14 | 1969-11-13 | 1970-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-14 | 1973-11-13 | 1974-05-15 | $7700.00 | Window Closed / Lapsed |