US3265657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for gelling aqueous polyvinyl alcohol solutions with chromium compounds
Assignee: EIDP Inc
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Filing: 1964-05-27
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Granted: 1966-08-09
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Expires: 1984-05-27
Abstract
No abstract record available.
Inventors
- 👤 Sinclair Harold King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:45
CPC Classifications
C; C08; C08F; C08F8/00; C08L; C08L29/00; C08L29/02; C08L29/04; C08F2810/00; C08F2810/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
THE PROCESS OF PREPARING AN AQUEOUS POLYVINYL ALCOHOL COMPOSITION, WHICH REMAINS FLUID FOR AT LEAST A FEW SECONDS AFTER PREPARATION AND SPONTANEOUSLY GELS THEREAFTER, WHICH PROCESS COMPRISES CONTACTING A GELLABLE FLUID AQUEOUS POLYVINYL ALCOHOL SOLUTION WITH A HEXAVALENT CHROMIUM COMPOUND DISSOLUBLE THEREIN TO PROVIDE AT LEAST ABOUT 3X10-4 GRAM ATOM OF HEXAVALENT CHROMIUM PER GRAM OF POLYVINYL ALCOHOL, AND A REDUCING AGENT DISSOLUBLE THEREIN IN AMOUNT AT LEAST EFFECTIVE TO REDUCE CHROMIUM BUT INEFFECTIVE ALONE TO GEL SAID POLYVANT CHROMIUM BUT INEFFECTIVE ALONE TO GEL SAID POLY VINYL ALCOHOL SOLUTION.
Claim 2
Dependent Claim
90 words
THE PROCESS OF PREPARING AN AQUEOUS POLYVINYL ALCOHOL COMPOSITION, WHICH REMAINS FLUID FOR AT LEAST A FEW SECONDS AFTER PREPARATION AND SPONTANEOUSLY GELS THEREAFTER, WHICH PROCESS COMPRISES CONTACTING A GELLABLE FLUID AQUEOUS POLYVINYL ALCOHOL SOLUTION WITH A HEXAVALENT CHROMIUM COMPOUND DISSOLUBLE THEREIN TO PROVIDE AT LEAST ABOUT 3X10-4 GRAM ATOM OF HEXAVALENT CHROMIUM PER GRAM OF POLYVINYL ALCOHOL, AND A REDUCING AGENT DISSOLUBLE THEREIN IN AMOUNT AT LEAST EFFECTIVE TO REDUCE CHROMIUM BUT INEFFECTIVE ALONE TO GEL SAID POLYVANT CHROMIUM BUT INEFFECTIVE ALONE TO GEL SAID POLY VINYL ALCOHOL SOLUTION.
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) | 1969-08-08 | 1970-02-07 | 1970-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-08 | 1974-02-07 | 1974-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-08 | 1978-02-07 | 1978-08-09 | $7700.00 | Window Closed / Lapsed |