Patent US3682867A successfully refreshed from Google Patents.
US3682867A
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Polyurea polymer preparation from organic polyisocyanates and complex derivatives of polyamines wherein the primary amine groups thereof are converted to aldimine or ketimine groups and the secondary amine group or groups thereof have been reacted with organic isocyanates
Assignee: WARREN J FULLEN
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Filing: 1970-05-06
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Granted: 1972-08-08
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Expires: 1990-05-06
Abstract
Abstract POLYAMINES HAVING THE PRIMARY AMINE GROUPS THEREOF CONVERTED TO ALDIMINE OR KETIMINE GROUPS AND AT LEAST ONE SECONDARY AMINE GROUP ARE REACTED WITH EQUIVALENT AMOUNTS OF ORGANIC ISOCYANATES TO YIELD NEW COMPOUNDS OR DERIVATIVES, THE EQUIVALENTS BEING BASED ON THE SECONDARY AMINE AND ISOCYANATE GROUPS. THE RESULTING PRODUCTS ARE REACTED WITH ORGANIC POLYISOCYANATES TO YIELD POLYMERS ESPECIALLY USEFUL AS COATINGS.
Inventors
- 👤 William E Shackelford
- 👤 Warren J Fullen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:47
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/32; C08G18/3225; C08G18/3253; C08G18/3256; C07; C07G; C07G99/00; C08G18/70; C08G18/72; C08G18/74; C08G18/75
Claims Analysis
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References Cited (Backward Citations)
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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 |