Patent US2576820A successfully refreshed from Google Patents.
US2576820A
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Reversible gel composition comprising polyvinyl alcohol and method of preparation
Assignee: GAF Chemicals Corp
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Filing: 1944-11-03
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Granted: 1951-11-27
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Expires: 1964-11-03
Abstract
No abstract record available.
Inventors
- 👤 Carl E Barnes
- 👤 Jr William O Ney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:09
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/053; C; C08; C08F; C08F8/00; C08F8/30; C08L; C08L29/00; C08L29/02; C08L29/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A FIRM, TRANSPARENT, THERMO-REVERSIBLE GEL CONSISTING OF A WATER-SOLUBLE POLYVINYL ALCOHOL, WATER AND FROM ABOUT 1 TO 20%, BASED ON THE WEIGHT OF THE POLYVINYL ALCOHOL, OF A WATERSOLUBLE NITROGENOUS COMPOUND SELECTED FROM THE GROUP CONSISTING OF WATER-SOLUBLE PROTEINS AND PROTEIN-DEGRADATION PRODUCTS, SAID GEL BEING PREPARED BY DRYING A SOLUTION IN WATER OF THE AFORESAID COMPONENTS, AND SWELLING THE DRIED PRODUCT THUS OBTAINED, IN COLD WATER.
Claim 2
Dependent Claim
66 words
A FIRM, TRANSPARENT, THERMO-REVERSIBLE GEL CONSISTING OF A WATER-SOLUBLE POLYVINYL ALCOHOL, WATER AND FROM ABOUT 1 TO 20%, BASED ON THE WEIGHT OF THE POLYVINYL ALCOHOL, OF A WATERSOLUBLE NITROGENOUS COMPOUND SELECTED FROM THE GROUP CONSISTING OF WATER-SOLUBLE PROTEINS AND PROTEIN-DEGRADATION PRODUCTS, SAID GEL BEING PREPARED BY DRYING A SOLUTION IN WATER OF THE AFORESAID COMPONENTS, AND SWELLING THE DRIED PRODUCT THUS OBTAINED, IN COLD WATER.
References Cited (Backward Citations)
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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) | 1954-11-26 | 1955-05-28 | 1955-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-26 | 1959-05-28 | 1959-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-26 | 1963-05-28 | 1963-11-27 | $7700.00 | Window Closed / Lapsed |