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Patent US4412010A successfully refreshed from Google Patents.
US4412010A
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Arc resistant insulator
Assignee: Mitsubishi Electric Corp
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Filing: 1982-05-14
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Granted: 1983-10-25
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Expires: 2002-05-14
Abstract
Abstract An arc resistant insulator composed of a composite composition comprising an insulating base material and a zinc borate hydrate. The insulating base material is composed of aluminum oxide and/or aluminum hydroxide and mica power. The zinc borate hydrate is composed essentially of 2ZnO.3B 2 O 3 .3H 2 O. The arc resistant insulator is prepared by mixing the insulating base material with a zinc borate hydrate forming material composed of normal boric acid, boric acid anhydride and zinc oxide and heating and compacting the mixture thus obtained in a closed system at a temperature of at least 155° C. under pressure of at least 50 kg/cm 2 .
Inventors
- 👤 Isao Ishii
- 👤 Tadaki Murakami
- 👤 Yoshiaki Sakamoto
- 👤 Yoshikazu Utsumi
- 👤 Tatsuharu Nakamura
- 👤 Hiroshi Takayanagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:44
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/12; C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; Y; Y10; Y10S; Y10S106/00; Y10S106/03
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
43 words
An arc resistant insulator which is composed of a matrix of a composite composition comprising an insulating base material containing aluminum oxide and/or aluminum hydroxide and mica powder, and a zinc borate hydrate composed essentially of 2ZnO.3B 2 O 3 .3H 2 O.
Claim 2
Dependent Claim
43 words
An arc resistant insulator which is composed of a matrix of a composite composition comprising an insulating base material containing aluminum oxide and/or aluminum hydroxide and mica powder, and a zinc borate hydrate composed essentially of 2ZnO.3B 2 O 3 .3H 2 O.
Claim 3
Dependent Claim
35 words
The arc resistant insulator according to claim 1 wherein the insulating base material contains 1 part by weight of aluminum oxide and/or aluminum hydroxide and from 0.2 to 1 part by weight of mica powder.
Claim 4
Dependent Claim
53 words
The arc resistant insulator according to claim 1 wherein the zinc borate hydrate composed essentially of 2ZnO.3B 2 O 3 .3H 2 O is formed by a mixture comprising from 3 to 7 moles of normal boric acid, 1 mole of boric acid anhydride and from 2.5 to 4.5 moles of zinc oxide.
Claim 5
Dependent Claim
48 words
The arc resistant insulator according to claim 3 wherein in a forming material comprising the insulating base material and the mixture for forming the zinc borate hydrate composed essentially of 2ZnO.3B 2 O 3 .3H 2 O, the insulating base material constitutes from 50 to 75% by weight.
Claim 6
Dependent Claim
76 words
A process for preparing an arc resistant insulator which comprises mixing an insulating base material composed of aluminum oxide and/or aluminum hydroxide and mica powder with a zinc borate hydrate forming material composed of normal boric acid, boric acid anhydride and zinc oxide, and heating and compacting the mixture thus obtained in a closed system at a temperature of at least 155° C. under pressure of at least 50 kg/cm 2 to form a formed product.
Claim 7
Dependent Claim
76 words
A process for preparing an arc resistant insulator which comprises mixing an insulating base material composed of aluminum oxide and/or aluminum hydroxide and mica powder with a zinc borate hydrate forming material composed of normal boric acid, boric acid anhydride and zinc oxide, and heating and compacting the mixture thus obtained in a closed system at a temperature of at least 155° C. under pressure of at least 50 kg/cm 2 to form a formed product.
Claim 8
Dependent Claim
34 words
The process according to claim 5 wherein from 50 to 75% by weight of the insulating base material is mixed with from 25 to 50% by weight of the zinc borate hydrate forming material.
Claim 9
Dependent Claim
35 words
The process according to claim 6 wherein the insulating base material is composed of 1 part by weight of aluminum oxide and/or aluminum hydroxide and from 0.2 to 1 part by weight of mica powder.
Claim 10
Dependent Claim
43 words
The process according to claim 5, 6 or 7 wherein the zinc borate hydrate forming material is composed of from 3 to 7 moles of normal boric acid, 1 mole of boric acid anhydride and from 2.5 to 4.5 moles of zinc oxide.
Claim 11
Dependent Claim
24 words
The process according to claim 5, 6 or 7 wherein the temperature for heating is within a range of from 160° to 200° C.
Claim 12
Dependent Claim
25 words
The process according to claim 5, 6 or 7 wherein the formed product is further heated at a temperature of from 160° to 200° C.
References Cited (Backward Citations)
US3310411A
Cited
US3827892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |