US3639338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reactive polyureas process of preparing same and use thereof in curing epoxy resins
Assignee: General Mills Inc
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Filing: 1968-05-06
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Granted: 1972-02-01
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Expires: 1988-05-06
Abstract
Abstract REACTIVE POLYUREAS PREPARED FROM DIPIMARY DIAMINES CONTAINING AT LEAST ONE SECONDARY AMINE GROUP AND DIISOCYANATES DERIVED FROM C36 TO C44 DIMERIZED FAT ACIDS. PROCESS OF PREPARING SAID POLYUREAS USING CHLOROFRM OR TRICHLOROETHYLENE AS REACTION SOLVENT. USE OF THE POLYUREAS TO CURE EPOXY RESINS.
Inventors
- 👤 Robert C Kuder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:23
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/75; C08G18/28; C08G18/30; C08G18/32; C08G18/3225; C08G18/3228; C08L; C08L63/00; Y; Y10; Y10S; Y10S528/00; Y10S528/906
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |