Patent US3682845A successfully refreshed from Google Patents.
US3682845A
Expired / Lapsed
US
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Polyurethanes derived from alkylene oxide adducts of trimethylol phenols and of polymers thereof
Assignee: Witco Corp
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Filing: 1970-10-16
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Granted: 1972-08-08
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Expires: 1990-10-16
Abstract
Abstract POLYURETHANES IN THE FORM OF ELASTOMERS, OR FLEXIBLE, SEMI-RIGID AND RIGID FOAMS, RESULTING FROM THE INTERACTION OF POLYISOCYANATES AND ALKYLENE OXIDE ADDUCTS OF TRIMETHYLOL PHENOL COMPOUNDS OR OF DIMERS, TRIMERS OR TETRAMERS OF SAID TRIMETHYLOL PHENOL COMPOUNDS.
Inventors
- 👤 Kermit D Longley
- 👤 Carl Bernstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:38
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/487; C08G18/4879
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |