US3136682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of leather-like open fibrous materials
Assignee: United Shoe Machinery Corp
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Filing: 1961-09-25
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Granted: 1964-06-09
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Expires: 1981-09-25
Abstract
No abstract record available.
Inventors
- 👤 Tu Shu-Tung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:48
CPC Classifications
C; C08; C08L; C08L89/00; C08L89/04; C08L89/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN A PROCESS FOR MAKING AN OPEN FIBERED LEATHERLIKE SHEET MATERIAL INCLUDING FORMING A SHEET COMPRISING AN INTIMATE MIXTURE OF COLLAGEN FIBVERS AND AN AQUOUS SOLUTION OF A WATER-SOLUBLE SKIN PROTENINOUS MATERIAL PRECIPITABLE BY A CHROME TANNING AGENT AND TANNING SAID SHEET, THE IMPROVEMENT COMPRISING THE STEPS OF GELLING THE SOLUTION OF PROTEINOUS MATERIAL, COOLING THE MATERIAL TO A TEMPERATURE BELOW 0*C. AT A SLOW RATE TO FREEZE THE WATER CONTENT OF SAID GEL AND DEVELOP RELATIVELY LARGE ICE CRYSTALS TO RUPTURE THE GEL STRUCTURE THEREAFTER WARMING SAID SHEET TO MELT SAID ICE CRYSTALS AND REMOVING WATER IN LIQUID STATE FROM SAID RUPTURED GEL.
Claim 2
Dependent Claim
104 words
IN A PROCESS FOR MAKING AN OPEN FIBERED LEATHERLIKE SHEET MATERIAL INCLUDING FORMING A SHEET COMPRISING AN INTIMATE MIXTURE OF COLLAGEN FIBVERS AND AN AQUOUS SOLUTION OF A WATER-SOLUBLE SKIN PROTENINOUS MATERIAL PRECIPITABLE BY A CHROME TANNING AGENT AND TANNING SAID SHEET, THE IMPROVEMENT COMPRISING THE STEPS OF GELLING THE SOLUTION OF PROTEINOUS MATERIAL, COOLING THE MATERIAL TO A TEMPERATURE BELOW 0*C. AT A SLOW RATE TO FREEZE THE WATER CONTENT OF SAID GEL AND DEVELOP RELATIVELY LARGE ICE CRYSTALS TO RUPTURE THE GEL STRUCTURE THEREAFTER WARMING SAID SHEET TO MELT SAID ICE CRYSTALS AND REMOVING WATER IN LIQUID STATE FROM SAID RUPTURED GEL.
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) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |