US3700629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphonitrile elastomers
Assignee: Horizons Research Inc
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Filing: 1971-03-26
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Granted: 1972-10-24
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Expires: 1991-03-26
Abstract
Abstract COPOLYMERS WERE PREPARED WHICH CONTAINED THE RANDOM REPEAT UNITS -(P(-Q)(-Q'')=N)X- IN WHICH Q IS EITHER F(CF2)PCH2O- OR H(CF2)PCH2OAND B IS EITHER RC8H4O OR RZC6H4O. THE VALUE OF P IS NOT GREATER THAN 9; Z IS -CH2-, OXYGEN, NH OR NR'' AND R AND R'' ARE H(CH2)Q-, OR F(CF2)Q- WHERE Q IS 0 TO 5. THESE COPOLYMERS WERE FOUND TO BE MUCH MORE STABLE THAN THE POLY(PHOSPHAZENES) REPORTED IN THE PAST.
Inventors
- 👤 Kennard A Reynard
- 👤 Selwyn H Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:32
CPC Classifications
C; C08; C08G; C08G79/00; C08G79/02; C08G79/025
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |