US3607790A
Expired / Lapsed
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Resistance material and method of making
Assignee: General Electric Co
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Filing: 1968-12-05
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Granted: 1971-09-21
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Expires: 1988-12-05
Abstract
Abstract Lightning-arrester resistance material is composed of silicon carbide particles and a binder therefor composed of cordierite formed of a fired mixture of cordierite-forming glass material and cordierite-forming crystalline material.
Inventors
- 👤 John J Pitha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:06
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/14; H01B1/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
48 words
A composition as defined in claim 1, said composition consisting essentially of, in percent by weight, about 6.0 to about 22.5 percent Of said glass material, about 8.0 to about 46.0 percent of said crystalline material, and about 55.0 to about 80.0 percent of said silicon carbide particles.
Claim 2
Dependent Claim
33 words
A composition as defined in claim 2, said crystalline material consisting essentially of, in percent by weight, about 40 to about 60 percent talc and about 60 to about 40 percent porcelain mixture.
Claim 3
Dependent Claim
54 words
A method of making nonlinear resistance material comprising the steps of providing a mixture as defined in claim 1, firing said mixture at elevated temperature for reacting said crystalline material, and cooling the thus-fired mixture for forming a cordierite binder for said silicon carbide particles from said mixture of glass material and crystalline material.
Claim 4
Dependent Claim
27 words
A method as defined in claim 4, including the step of compacting said mixture of silicon carbide particles and said cordierite-forming material prior to said firing step.
Claim 5
Dependent Claim
40 words
A method as defined in claim 5, said elevated temperature being in the range of about 1,200* C. to about 1,300* C. 7 . A method as defined in claim 6, said compacted mixture being fired in a hydrogen atmosphere.
Claim 6
Dependent Claim
37 words
A nonlinear resistance material having improved low voltage resistance characteristics coupled with a high capacity for withstanding repeated current surges for use in overvoltage protective devices, said material being made by the process defined in claim 4.
Claim 7
Dependent Claim
37 words
A nonlinear resistance material having improved low voltage resistance characteristics coupled with a high capacity for withstanding repeated current surges for use in overvoltage protective devices, said material being made by the process defined in claim 6.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |