Patent US2637644A successfully refreshed from Google Patents.
Patent US2644807A successfully refreshed from Google Patents.
US2644807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinyl acetal resins
Assignee: Universal Oil Products Co
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Filing: 1951-03-08
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Granted: 1953-07-07
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Expires: 1971-03-08
Abstract
No abstract record available.
Inventors
- 👤 Herman S Bloch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:25
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/28; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
20 words
THE RESINOUS CONDENSATION PRODUCT OF A PARTIALLY HYDROLYZED POLYVINYL ALCOHOL ESTER HOMOPOLYMER AND A CONSENSATION PRODUCT OF AMMONIA AND BUTYRALDEHYDE.
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) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |