Patent US2598309A successfully refreshed from Google Patents.
US4066604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Branched polyphenylene-mica composites
Assignee: BP Corp North America Inc
•
Filing: 1976-10-28
•
Granted: 1978-01-03
•
Expires: 1996-10-28
Abstract
Abstract A composite formed at relatively low temperature from branched polyphenylene and mica exhibits excellent mechanical properties after heat aging.
Inventors
- 👤 Chen-Shen Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:07
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
44 words
A high temperature resistant composite comprising from about 50 to 90 wt. % mica and from about 10 to 50 wt.% branched polyphenylene having at least about 8% by weight of its benzene ring structures bonded to three or more other benzene ring structures.
Claim 2
Dependent Claim
44 words
A high temperature resistant composite comprising from about 50 to 90 wt. % mica and from about 10 to 50 wt.% branched polyphenylene having at least about 8% by weight of its benzene ring structures bonded to three or more other benzene ring structures.
Claim 3
Dependent Claim
19 words
The composite of claim 1 wherein the branched polyphenylene has an inherent viscosity ranging from about 0.025 to 0.17.
Claim 4
Dependent Claim
19 words
The composite of claim 2 wherein the branched polyphenylene has an inherent viscosity ranging from about 0.05 to 0.12.
Claim 5
Dependent Claim
17 words
The composite of claim 1 which contains up to about 10 wt. % of a crosslinking agent.
Claim 6
Dependent Claim
10 words
The composite of claim 1 wherein the mica is phlogopite.
Claim 7
Dependent Claim
14 words
The composite of claim 4 wherein the crosslinking agent is nitropolyphenylene or sulfonated polyphenylene.
Claim 8
Dependent Claim
25 words
The composite of claim 5 containing about 20 to 40 wt. % branched polyphenylene having an inherent viscosity ranging from about 0.05 l to 0.12.
Claim 9
Dependent Claim
21 words
The composite of claim 1 wherein the mica has a particle size ranging from about -400 mesh to about 100 mesh.
Claim 10
Dependent Claim
21 words
The composite of claim 3 wherein the mica has a particle size ranging from about -400 mesh to about 100 mesh.
Claim 11
Dependent Claim
16 words
The composite of claim 5 wherein the mica has a particle size of about -325 mesh.
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) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |