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US4436829A
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Glass frits containing WO3 or MoO3 in RuO2 -based resistors
Assignee: Corning Glass Works
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Filing: 1982-02-04
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Granted: 1984-03-13
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Expires: 2002-02-04
Abstract
Abstract This invention is concerned with the fabrication of thick film, RuO 2 -based resistors. More specifically, this invention is directed to the formulation of glass frits for use in such resistors exhibiting temperature coefficient of resistance values of less than 100 ppm. Such glass frits consist essentially, expressed in terms of mole percent on the oxide basis, of about 32-39% PbO, 44-47% B 2 O 3 , 14-17% SiO 2 , and an effective amount up to 5% of WO 3 or MoO 3 .
Inventors
- 👤 Robert G. Howell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:39
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/06; C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C8/00; C03C8/02; C03C8/10; C03C8/14; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06533; H01C17/0654
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
82 words
Glass frit compositions for use in thick film, RuO 2 -based resistor inks suitable for application to alumina substrates exhibiting coefficients of thermal expansion approximating that of the alumina substrate material and temperature coefficient of resistance values of less than 100 ppm which consist essentially, expressed in terms of mole percent on the oxide basis, of about 32-39% PbO, 44-47% B 2 O 3 , 14-17% SiO 2 , and an effective amount of WO 3 or MoO 3 up to 5%.
Claim 2
Dependent Claim
82 words
Glass frit compositions for use in thick film, RuO 2 -based resistor inks suitable for application to alumina substrates exhibiting coefficients of thermal expansion approximating that of the alumina substrate material and temperature coefficient of resistance values of less than 100 ppm which consist essentially, expressed in terms of mole percent on the oxide basis, of about 32-39% PbO, 44-47% B 2 O 3 , 14-17% SiO 2 , and an effective amount of WO 3 or MoO 3 up to 5%.
Claim 3
Dependent Claim
18 words
Glass frit compositions according to claim 1 wherein said WO 3 or MoO 3 content ranges about 2-4%.
References Cited (Backward Citations)
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US3304199A
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US3766511A
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US3916037A
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US3924221A
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US4286251A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |