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US4486546A
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Process for preparing a heat resistant soft composite
Assignee: Mitsubishi Electric Corp
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Filing: 1983-09-19
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Granted: 1984-12-04
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Expires: 2003-09-19
Abstract
Abstract A process for preparing a heat resistant soft composite which comprises hot-pressing a mixture comprising talc powder and mica powder as major components and a bonding material composed of normal boric acid, boric acid anhydride and zinc oxide, at a temperature of from 160 DEG to 200 DEG C. under pressure of from 50 to 100 kg/cm2 to form a composite, and subjecting the composite to heat treatment at a temperature of from 450 DEG to 500 DEG C.
Inventors
- 👤 Tadaki Murakami
- 👤 Yasuhiko Ikeda
- 👤 Isao Ishii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:09
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/645; C03; C03B; C03B40/00; C04B28/00; C04B35/01; C04B35/16; C04B35/18; C04B35/19; C04B35/20; Y; Y10; Y10S; Y10S106/00; Y10S106/03
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
76 words
A process for preparing a heat resistant soft composite which comprises hot-pressing a mixture comprising talc powder and mica powder as major components and a bonding material composed of normal boric acid, boric acid anhydride and zinc oxide, at a temperature of from 160 to 200° C. under pressure of from 50 to 100 kg/cm 2 to form a composite, and subjecting the composite to heat treatment at a temperature of from 450 to 500° C.
Claim 2
Dependent Claim
76 words
A process for preparing a heat resistant soft composite which comprises hot-pressing a mixture comprising talc powder and mica powder as major components and a bonding material composed of normal boric acid, boric acid anhydride and zinc oxide, at a temperature of from 160 to 200° C. under pressure of from 50 to 100 kg/cm 2 to form a composite, and subjecting the composite to heat treatment at a temperature of from 450 to 500° C.
Claim 3
Dependent Claim
49 words
The process according to claim 1 wherein said mixture has the following composition: major components: 25-45% by weight of talc powder 15-40% by weight of mica powder bonding material: 16.30-18.63% by weight of normal boric acid 3.68-4.20% by weight of boric acid anhydride 15.62-17.17% by weight of zinc oxide
Claim 4
Dependent Claim
46 words
A heat resistant soft composite comprising 26.9-49.0% by weight of a talc component, 16.3-43.1% by weight of a mica component, 13.9-16.0% by weight of a B 2 O 3 component, and 16.2-18.7% by weight of a ZnO component, prepared by the process according to claim 1.
References Cited (Backward Citations)
US4412010A
Cited
US4436831A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |