Patent US3645971A successfully refreshed from Google Patents.
US3645971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire retardant epoxy resins containing phosphoramidates
Assignee: Hooker Chemical Corp
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Filing: 1969-03-10
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Granted: 1972-02-29
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Expires: 1989-03-10
Abstract
Abstract THERE IS PROVIDED A PROCESS FOR PRODUCING FIRE RETARDANT EPOXY RESINS WHICH COMPRISES CURING A MIXTURE OF (1) AN EPOXY RESIN AND (2) A PHOSPHORAMIDATE OF A FORMULA SELECTED FROM THE GROUP CONSISTING OF: (R-O-)X-P(=O)(-NH-R'')Y AND R".(-O-P(=O)(-NHR'')-O-) WHEREIN R IS ALKYL, ARYL, SUBSTITUTED ALKYL OR SUBSTITUTED ARYL R'' IS HYDROGEN OR R, R" IS HYDROCARBYLIDENE, X IS O TO 2, Y IS 1 TO 3 AND THE SUM OF X AND Y IS 3. AN AMINE CAN BE EMPLOYED TO IMPROVE THE PROCESS.
Inventors
- 👤 Raymond R Hindersinn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:40
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/44; C08G59/446; C08G59/50; C08G59/504
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |