US3687902A
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US
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Polyureas obtained by reacting toluene diisocyanate with ab,b-bis(alkylamino)diethylsulfone
Assignee: ALBERT C PERRINO
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Filing: 1970-06-01
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Granted: 1972-08-29
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Expires: 1990-06-01
Abstract
Abstract Beta , Beta ''-BIS(ALKYLAMINO) DIETHYL SULFONES AND POLYAMIDES AND POLYUREAS OBTAINED THEREFROM.
Inventors
- 👤 Albert C Perrino
- 👤 Michael G Israel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:08
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3855; C08G18/3863; C08G18/3865; C08G18/3872; C08G69/00; C08G69/42; Y; Y10; Y10S; Y10S528/00; Y10S528/905; Y10S528/906
Claims Analysis
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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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |