US3740377A
Expired / Lapsed
US
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One-step preparation of a polyurethaneurea resin using a tetraalkylguanidine or isocyanate adduct thereof as a catalyst
Assignee: Qo Chemicals Inc
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Filing: 1972-02-11
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Granted: 1973-06-19
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Expires: 1992-02-11
Abstract
Abstract THIS INVENTION RELATES TO A ONE-STEP PROCESS FOR THE CURING OF MIXTURES OF POLYISOCYANATES, POLYOLS, AND CERTAIN AROMATIC DIAMINES TO FORM POLYURETHANE-UREA RESINS USEFUL FOR FILMS AND COATINGS OR FOR OTHER STANDARD URETHANE APPLICATIONS, AND HAS PARTICULAR RELATION TO A CATALYST FOR THE ONE-STEP CURING OF SAID MIXTURES.
Inventors
- 👤 G Huffman
- 👤 N Rustad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:49
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/28; C08G18/65; C08G18/66; Y; Y10; Y10S; Y10S528/00; Y10S528/906
Claims Analysis
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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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |