US3258442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of an aqueous polyvinyl alcohol composition
Assignee: EIDP Inc
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Filing: 1964-05-27
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Granted: 1966-06-28
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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
2026-10-26 01:28
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
93 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 AT A PH BELOW 5 WITH A TRIVALENT TITANIUM COMPOUND DISSOLUBLE THEREIN TO PROVIDE AT LEAST AOUT 1X10-**4 GRAM ATOM OF TRIVALENT TITANIUM PER GRAM OF POLYVINYL ALCOHOL, AND AN OXIDIZING AGENT DISSOLUBLE THEREIN IN AMOUNT AT LEAST EFFECTIVE TO OXIDIZE SAID AMOUNT OF TRIVALENT TITANIUM TO TETRAVELENT TITANIUM, BUT INEFFECTIVE ALONG TO GET SAID POLYVINYL ALCOHOL SOLUTION.
Claim 2
Dependent Claim
93 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 AT A PH BELOW 5 WITH A TRIVALENT TITANIUM COMPOUND DISSOLUBLE THEREIN TO PROVIDE AT LEAST AOUT 1X10-**4 GRAM ATOM OF TRIVALENT TITANIUM PER GRAM OF POLYVINYL ALCOHOL, AND AN OXIDIZING AGENT DISSOLUBLE THEREIN IN AMOUNT AT LEAST EFFECTIVE TO OXIDIZE SAID AMOUNT OF TRIVALENT TITANIUM TO TETRAVELENT TITANIUM, BUT INEFFECTIVE ALONG TO GET SAID POLYVINYL ALCOHOL SOLUTION.
References Cited (Backward Citations)
US2518193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-27 | 1969-12-27 | 1970-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-27 | 1973-12-27 | 1974-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $7700.00 | Window Closed / Lapsed |