US3121049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for colloidally dispersing collagen
Assignee: NIHON HIKAKU
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Filing: 1961-08-24
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Granted: 1964-02-11
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Expires: 1981-08-24
Abstract
No abstract record available.
Inventors
- 👤 Nishihara Tomio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:38
CPC Classifications
C; C09; C09H; C09H3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A PROCESS FOR DISPERSING COLLOIDALLY COLLAGEN FIBER MATERIALS, WHICH ARE NORMALLY INSOLUBLE IN DILUTE ACID, ALKALI AND NEUTRAL SALT SOLUTIONS, INTO A FIBER REPRODUCIBLE STATE, COMPRISING THE STEPS OF; FIRSTLY, DE-NATURING THE COLLAGENOUS MATERIAL BY PREHEATING IT FOR 20 MINUTES TO 63*C.; SECONDLY, RE-NATURING THE PRODUCT OF THE FIRST STEP BY COOLING IT TO 25*C. AN DIMMERSING IT IN AN ACID BUFFER SOLUTION OF PH8; THIRDL.Y, TREATING THE PRODUCT OF THE SECOND STEP WITH A PROTEOLYTIC ENZYME SELECTED FROM A CLASS CONSISTING OF TRYPSIN, CHYMOTRYPSIN, AND PANCREATIN, FOR 48 HOURS, AND FOURTHLY, DISPERSING THE PRODUCT OF THE THIRD STEP INTO 0.5% ACETIC ACID SOLUTION FOR SIX HOURS FOR EXTRACTION.
Claim 2
Dependent Claim
109 words
A PROCESS FOR DISPERSING COLLOIDALLY COLLAGEN FIBER MATERIALS, WHICH ARE NORMALLY INSOLUBLE IN DILUTE ACID, ALKALI AND NEUTRAL SALT SOLUTIONS, INTO A FIBER REPRODUCIBLE STATE, COMPRISING THE STEPS OF; FIRSTLY, DE-NATURING THE COLLAGENOUS MATERIAL BY PREHEATING IT FOR 20 MINUTES TO 63*C.; SECONDLY, RE-NATURING THE PRODUCT OF THE FIRST STEP BY COOLING IT TO 25*C. AN DIMMERSING IT IN AN ACID BUFFER SOLUTION OF PH8; THIRDL.Y, TREATING THE PRODUCT OF THE SECOND STEP WITH A PROTEOLYTIC ENZYME SELECTED FROM A CLASS CONSISTING OF TRYPSIN, CHYMOTRYPSIN, AND PANCREATIN, FOR 48 HOURS, AND FOURTHLY, DISPERSING THE PRODUCT OF THE THIRD STEP INTO 0.5% ACETIC ACID SOLUTION FOR SIX HOURS FOR EXTRACTION.
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) | 1967-02-10 | 1967-08-12 | 1968-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-10 | 1971-08-12 | 1972-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-10 | 1975-08-12 | 1976-02-11 | $7700.00 | Window Closed / Lapsed |