US3856713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elastomeric poly(aryloxyphosphazene) copolymers
Assignee: Horizons Inc
•
Filing: 1973-06-11
•
Granted: 1974-12-24
•
Expires: 1993-06-11
Abstract
Abstract Aryloxyphosphazene copolymers which are elastomers are described. These materials are thermally and hydrolytically stable and many of the copolymers are useful as fire-retardant materials.
Inventors
- 👤 S Rose
- 👤 K Reynard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:33
CPC Classifications
C; C08; C08G; C08G79/00; C08G79/02; C08G79/025
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
9 words
Copolymers of claim 1 in which R1 is C2H5.
Claim 2
Dependent Claim
9 words
Copolymers of claim 1 in which R1 is sec-C4H9.
Claim 3
Dependent Claim
9 words
Copolymers of claim 1 in which R1 is t-C4H9.
Claim 4
Dependent Claim
9 words
Copolymers of claim 1 in which R1 is t-C5H11.
Claim 5
Dependent Claim
9 words
Copolymers of claim 1 in which R1 is C4H19.
Claim 6
Dependent Claim
27 words
The process for the preparation of the copolymers of claim 1 wherein poly(dichlorophosphazene and alkali metal salts of phenol and of alkylaryl phenol are reacted at 115*-160*C.
Claim 7
Dependent Claim
11 words
Shaped articles and films prepared from the copolymers of claim 1.
References Cited (Backward Citations)
US3370020A
Cited
US3702833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |