US3776772A
Expired / Lapsed
US
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Electrical resistance composition and resistance element
Assignee: Shoei Chemical Inc
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Filing: 1971-11-17
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Granted: 1973-12-04
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Expires: 1991-11-17
Abstract
Abstract An electrical resistance composition has been provided using particles of ruthenium oxide which are coated with niobium and/or niobium oxide, and a glass frit.
Inventors
- 👤 E Asada
- 👤 M Nakagome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:31
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06533; H01C17/0654
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
29 words
The composition of claim 1, wherein the ratio of ruthenium oxide to Niobium component is from 1 to 40:1, and the particle size is less than 50 Mu .
Claim 2
Dependent Claim
19 words
The composition of claim 1, wherein the ratio of ruthenium oxide to niobium component is from 4 to 20:1.
Claim 3
Dependent Claim
58 words
An electrical resistance element which comprises a high temperature resistant, electrically non-conductive substrate having a film of resistance material coated thereon wherein said resistance material comprises a sintered mixture of ruthenium oxide coated with niobium, niobium oxide or mixtures thereof wherein the ratio of ruthenium oxide to niobium component is from 1 to 40:1, and a glass frit.
Claim 4
Dependent Claim
24 words
The element of claim 4, wherein the ratio of coated ruthenium oxide particles to said glass frit is from 1 to 85:99 to 15.
References Cited (Backward Citations)
US3031344A
Cited
US3352797A
Cited
US3562122A
Cited
US3637344A
Cited
US3637530A
Cited
US3622367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |