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Patent US4293839A successfully refreshed from Google Patents.
US4293839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thick film resistor
Assignee: Shoei Chemical Inc
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Filing: 1980-03-12
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Granted: 1981-10-06
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Expires: 2000-03-12
Abstract
Abstract A thick film resistor comprising a resistive film element comprising 100 parts by weight of RuO 2 and glass and 0.1 to 15 parts by weight of Au, electrodes containing not less than 50 weight percent of Ag therein connected to the terminal portions of the resistive film element, and an insulating substrate on which the resistive film element and the electrodes are formed.
Inventors
- 👤 Eiichi Asada
- 👤 Toshio Inokuma
- 👤 Isao Egawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:26
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06553; H01C17/06533; H01C17/0654; H01C7/00; H01C7/003
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
90 words
A thick film resistor, comprising: an electrically insulating substrate; a resistive film element on said substrate, said resistive film element consisting essentially of (A) 100 parts by weight of RuO 2 and glass, and (B) 0.1 to 15 parts by weight of Au, wherein the ratio of RuO 2 to glass is effective to provide the desired resistance of said thick film resistor; and electrodes on said substrate and overlapped with the terminal portions of said resistive film element, said electrodes containing not less than 50 weight percent of Ag.
Claim 2
Dependent Claim
90 words
A thick film resistor, comprising: an electrically insulating substrate; a resistive film element on said substrate, said resistive film element consisting essentially of (A) 100 parts by weight of RuO 2 and glass, and (B) 0.1 to 15 parts by weight of Au, wherein the ratio of RuO 2 to glass is effective to provide the desired resistance of said thick film resistor; and electrodes on said substrate and overlapped with the terminal portions of said resistive film element, said electrodes containing not less than 50 weight percent of Ag.
Claim 3
Dependent Claim
20 words
A thick film resistor as claimed in claim 1, wherein said glass of said resistive film element is borosilicate glass.
Claim 4
Dependent Claim
29 words
A thick film resistor as claimed in claim 1 in which component (A) contains from 3 to 50 weight percent of RuO 2 and the balance is essentially glass.
Claim 5
Dependent Claim
22 words
A thick film resistor as claimed in claim 1 in which said resistive film element consists of component (A) and component (B).
Claim 6
Dependent Claim
25 words
A thick film resistor as claimed in claim 1 in which said resistive film element contains from 0.2 to 12 parts by weight of Au.
Claim 7
Dependent Claim
33 words
A thick film resistor as claimed in claim 1 in which the Ag in said electrodes has migrated into said terminal portions of said resistive film element and has formed an Ag-Au alloy.
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) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |