Patent US4152494A successfully refreshed from Google Patents.
US4152494A
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US
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Flame resistant, heat insulative foamed polyphenylenes
Assignee: BP Corp North America Inc
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Filing: 1977-12-29
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Granted: 1979-05-01
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Expires: 1997-12-29
Abstract
Abstract A low density, flame-resistant foamed composition is formed by heating a thorough mixture of branched polyphenylene and an inorganic fiber to above about 800 DEG F.
Inventors
- 👤 Chen-Shen Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:56
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J9/0085; C08K; C08K7/00; C08K7/02; C08K7/04; C08L; C08L65/00; C08L65/02; C08L81/00; C08L81/02; C08J2365/00; C08J2365/02; C08J2481/00; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10S521/00; Y10S521/907; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249986
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
82 words
A rigid, foamed composition having a density less than 1, produced by heating a thorough mixture comprising about 20 to about 70 wt.% branched polyphenylene, formed using a metal oxide catalyst, having at least about 8 wt.% of its benzene ring structure bonded to three or more other benzene ring structures and having an inherent viscosity between about 0.025 and about 0.17, and about 80 to about 30 wt.% inorganic fiber selected from the group consisting of processed mineral fiber and asbestos.
Claim 2
Dependent Claim
82 words
A rigid, foamed composition having a density less than 1, produced by heating a thorough mixture comprising about 20 to about 70 wt.% branched polyphenylene, formed using a metal oxide catalyst, having at least about 8 wt.% of its benzene ring structure bonded to three or more other benzene ring structures and having an inherent viscosity between about 0.025 and about 0.17, and about 80 to about 30 wt.% inorganic fiber selected from the group consisting of processed mineral fiber and asbestos.
Claim 3
Dependent Claim
14 words
The foamed composition of claim 1 wherein the inorganic fiber is processed mineral fiber.
Claim 4
Dependent Claim
22 words
The foamed composition of claim 1 which has a density of less than about 1 g/cc and greater than about 0.2 g/cc.
Claim 5
Dependent Claim
16 words
The foamed composition of claim 3 which has a density of less than about 0.5 g/cc.
Claim 6
Dependent Claim
22 words
The foamed composition of claim 2 which has a density of less than about 1 g/cc and greater than about 0.2 g/cc.
Claim 7
Dependent Claim
16 words
The foamed composition of claim 5 which has a density of less than about 0.5 g/cc.
Claim 8
Dependent Claim
14 words
The foamed composition of claim 1 containing up to about 10 wt.% polyphenylene sulfide.
Claim 9
Dependent Claim
22 words
The foamed composition of claim 5 which is formed from about 30 wt.% branched polyphenylene and about 70 wt.% processed mineral fiber.
References Cited (Backward Citations)
US3124542A
Cited
US2361438A
Cited
US3582502A
Cited
FR2058431A5
Cited
US3829518A
Cited
US4055695A
Cited
US3855332A
Cited
US3792099A
Cited
US3798281A
Cited
US4049593A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |