US3071483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of collagen products
Assignee: United Shoe Machinery Corp
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Filing: 1960-05-03
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Granted: 1963-01-01
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Expires: 1980-05-03
Abstract
No abstract record available.
Inventors
- 👤 Tu Shu Tung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:17
CPC Classifications
D; D01; D01C; D01C3/00; C; C08; C08L; C08L89/00; C08L89/04; C08L89/06; C08K; C08K3/00; C08K3/30; C08L2205/00; C08L2205/02; Y; Y10; Y10S; Y10S128/00; Y10S128/08; Y10S530/00; Y10S530/827; Y10S530/842
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
A METHOD FOR FORMING SKIN-LIKE COLLAGEN FIBER MASSES COMPRISING THE STEPS OF FORMING A MIXTURE OF EXISTING COLLAGEN FIBERS AND AN AQUEOUS SOLUTION OF COLLAGEN, SAID MIXTURE BEING ADJACENT AS TO TEMPERATURE AND PH TO PREVENT PREMATURE PRECIPITATION OF COLLAGEN FROM SOLUTION SHAPING THE MIXTURE INTO A SHEET, THEREAFTER BRINGING THE SHEET INTO INTIMATE PENETRATING CONTACT WITH AN AQUEOUS SOLUTION CONTAINING AN APPROXIMATELY 30% TO 50% BASIC CHROMIUM TANNING COMPOUND, SAID SOLUTION OF CHROMIUM COMPOUND CONTAINING FROM ABOUT 1% TO ABOUT 5% BY WEIGHT OF CHROMIUM COMPOUND CALCULATED AS CR2 O3, THE PH AND QUANTITY OF SAID SOLUTION OF CHROMIUM COMPOUND PENETRATING SAID SHEET PROVIDING A PH IN SAID SHEET OF FROM ABOUT PH 3 TO ABOUT PH 5, REACTING SAID CHROMIUM COMPOUND WITH THE DISSOLVED COLLAGEN TO PRECIPITATE COLLAGEN FIBERS CONTAINING AT LEAST 0.2% BY WEIGHT OF COMBINED CHROMIUM CALCULATED AS CR2O3 BASED ON THE WEIGHT OF THE PRECIPITATED COLLAGEN, AND REMOVING THE FLUID FROM THE SHEET.
Claim 2
Independent Claim
158 words
A METHOD FOR FORMING SKIN-LIKE COLLAGEN FIBER MASSES COMPRISING THE STEPS OF FORMING A MIXTURE OF EXISTING COLLAGEN FIBERS AND AN AQUEOUS SOLUTION OF COLLAGEN, SAID MIXTURE BEING ADJACENT AS TO TEMPERATURE AND PH TO PREVENT PREMATURE PRECIPITATION OF COLLAGEN FROM SOLUTION SHAPING THE MIXTURE INTO A SHEET, THEREAFTER BRINGING THE SHEET INTO INTIMATE PENETRATING CONTACT WITH AN AQUEOUS SOLUTION CONTAINING AN APPROXIMATELY 30% TO 50% BASIC CHROMIUM TANNING COMPOUND, SAID SOLUTION OF CHROMIUM COMPOUND CONTAINING FROM ABOUT 1% TO ABOUT 5% BY WEIGHT OF CHROMIUM COMPOUND CALCULATED AS CR2 O3, THE PH AND QUANTITY OF SAID SOLUTION OF CHROMIUM COMPOUND PENETRATING SAID SHEET PROVIDING A PH IN SAID SHEET OF FROM ABOUT PH 3 TO ABOUT PH 5, REACTING SAID CHROMIUM COMPOUND WITH THE DISSOLVED COLLAGEN TO PRECIPITATE COLLAGEN FIBERS CONTAINING AT LEAST 0.2% BY WEIGHT OF COMBINED CHROMIUM CALCULATED AS CR2O3 BASED ON THE WEIGHT OF THE PRECIPITATED COLLAGEN, AND REMOVING THE FLUID FROM THE SHEET.
References Cited (Backward Citations)
US2934446A
Cited
US2934447A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-31 | 1966-07-02 | 1967-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-31 | 1970-07-02 | 1971-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-31 | 1974-07-02 | 1975-01-01 | $7700.00 | Window Closed / Lapsed |