US3791859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stress grading coatings for insulators
Assignee: ABB Inc USA
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Filing: 1972-02-04
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Granted: 1974-02-12
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Expires: 1992-02-04
Abstract
Abstract A stress grading coating for insulators comprising a non-linear semiconducting coating, such as silicon carbide, or the like using a glass binder having a fusion temperature of less than 850*C.
Inventors
- 👤 C Hirayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:22
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/085; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/252
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
38 words
The insulator of claim 1 wherein said insulating body is comprised of ceramic material and said ceramic coating and said binder being fired onto said insulating body at a temperature of less than 800*C for approximately 15 minutes.
Claim 2
Dependent Claim
23 words
The insulator of claim 1 wherein a glaze is applied over said insulating body, and said ceramic coating is fired onto said glaze.
Claim 3
Dependent Claim
15 words
The insulator of claim 1 wherein a glazed layer is applied over said ceramic coating.
Claim 4
Dependent Claim
23 words
An electric insulator as claimed in claim 1 wherein: said binder comprises 40 percent to 70 percent by volume of said ceramic coating.
Claim 5
Dependent Claim
20 words
An electric insulator as claimed in claim 5 wherein: said binder comprises glass having a fusion temperature of approximately 650*C.
Claim 6
Dependent Claim
18 words
An electric insulator as claimed in claim 6 wherein: said binder comprises PbO, Al2O3, B2O3, MgO, and LiF.
Claim 7
Dependent Claim
33 words
An electric insulator as claimed in claim 6 wherein: said binder comprises a glass having substantially a percent composition by weight of 22.0 PbO, 616 Al2O3, 65.3 B2O3, 2.6 MgO, and 3.4 LiF.
Claim 8
Dependent Claim
20 words
An electric insulator as claimed in claim 5 wherein: said binder comprises glass having a fusion temperature of approximately 800*C.
Claim 9
Dependent Claim
16 words
An electric insulator as claimed in claim 9 wherein: said binder comprises B2O3, Al2O3, and BaO.
Claim 10
Dependent Claim
29 words
An electric insulator as claimed in claim 10 wherein: said binder comprises a glass having substantially a percent composition by weight of 54.2 B2O3, 11.5 Al2O3, and 34.3 BaO.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |