Patent US4139832A successfully refreshed from Google Patents.
US4139832A
Expired / Lapsed
US
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Glass-coated thick film resistor
Assignee: Hitachi Ltd
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Filing: 1977-03-01
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Granted: 1979-02-13
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Expires: 1997-03-01
Abstract
Abstract A glas-coated thick film resistor can be obtained by coating completely with a crystallizable glass having a crystallizing temperature of 400 to 600 DEG C and consisting of 62 to 80% by weight of PbO, 5 to 31% by weight of ZnO, 5 to 18% by weight of B2O3, 0.2 to 8% by weight of Al2O3 and 1 to 5% by weight of SiO2.
Inventors
- 👤 Yoshimi Yoshino
- 👤 Nobuyuki Sugishita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:49
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
A glass-coated thick film resistor comprising a substrate, at least two terminals formed on said substrate, a resistor formed on said substrate and between said at least two terminals, and a crystallized glass coating-layer formed on said substrate by covering said resistor, wherein said crystallized glass-coating layer is formed by firing a crystallizable glass-coating consisting of 62 to 80% by weight of PbO, 5 to 31% by weight of ZnO, 5 to 18% by weight of B 2 O 3 , 0.2 to 8% by weight of Al 2 O 3 and 1 to 5% by weight of SiO 2 and having a crystallizing temperature of 400° to 600° C.
Claim 2
Dependent Claim
110 words
A glass-coated thick film resistor comprising a substrate, at least two terminals formed on said substrate, a resistor formed on said substrate and between said at least two terminals, and a crystallized glass coating-layer formed on said substrate by covering said resistor, wherein said crystallized glass-coating layer is formed by firing a crystallizable glass-coating consisting of 62 to 80% by weight of PbO, 5 to 31% by weight of ZnO, 5 to 18% by weight of B 2 O 3 , 0.2 to 8% by weight of Al 2 O 3 and 1 to 5% by weight of SiO 2 and having a crystallizing temperature of 400° to 600° C.
Claim 3
Dependent Claim
67 words
A glass-coated thick film resistor according to claim 1, further comprising: a conductive pad formed on said substrate adjacent one of said terminals; a semiconductor element formed on said conductive pad; a conductive element coupled between said semiconductor element and said adjacent one of said terminals; and a resin film covering said conductive pad, said semiconductor element, said conductive element and said adjacent one of said terminals.
Claim 4
Dependent Claim
14 words
A glass-coated thick film resistor according to claim 1, wherein said substrate comprises alumina.
Claim 5
Dependent Claim
23 words
A glass-coated thick film resistor according to claim 3, wherein said resistor is selected from a group consisting of RuO 2 and Ag-Pd.
Claim 6
Dependent Claim
14 words
A glass-coated thick film resistor according to claim 3, wherein said terminals comprise Ag-Pd.
References Cited (Backward Citations)
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US3374110A
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US3434877A
Cited
US3849757A
Cited
US3916037A
Cited
US3914514A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-12 | 1982-08-14 | 1983-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-12 | 1986-08-14 | 1987-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-12 | 1990-08-14 | 1991-02-13 | $7700.00 | Window Closed / Lapsed |