US4574055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistor compositions
Assignee: Shoei Chemical Inc
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Filing: 1984-12-12
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Granted: 1986-03-04
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Expires: 2004-12-12
Abstract
Abstract A resistor composition comprising conductive particles, a glass frit and a vehicle in which RuO2 particles coated with a polynary oxide of Bi and/or Pb and Ru are employed and, by using the surface-coated RuO2, the composition can provide readily a improved resistor having a advantageous combination of properties, particularly a very small absolute TCR and high voltage stability throughout a wide resistance range. The produced resistor can be successfully laser-trimmed without adversely affecting the properties thereof.
Inventors
- 👤 Eiichi Asada
- 👤 Toshio Inokuma
- 👤 Mikio Yamazoe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:55
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06533; H01C17/0654; C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C8/00; C03C8/02; C03C8/10; C03C8/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
111 words
A resistor composition comprising conductive particles, a glass frit and a vehicle, said conductive particles comprising particles selected from the group consisting of coated RuO 2 particles and a mixture of said coated RuO 2 particles and uncoated RuO 2 particles wherein the weight ratio of coated RuO 2 particles/uncoated RuO 2 particles is from 5/95 to 100/0, said coated RuO 2 particles having a polynary oxide coating of a metal component selected from the group consisting of (1) Bi and Ru; (2) Pb and Ru; and (3) Bi, Pb and Ru; the weight ratio of said conductive particles to said glass frit being in the range of 60:40 to 5:95.
Claim 2
Dependent Claim
111 words
A resistor composition comprising conductive particles, a glass frit and a vehicle, said conductive particles comprising particles selected from the group consisting of coated RuO 2 particles and a mixture of said coated RuO 2 particles and uncoated RuO 2 particles wherein the weight ratio of coated RuO 2 particles/uncoated RuO 2 particles is from 5/95 to 100/0, said coated RuO 2 particles having a polynary oxide coating of a metal component selected from the group consisting of (1) Bi and Ru; (2) Pb and Ru; and (3) Bi, Pb and Ru; the weight ratio of said conductive particles to said glass frit being in the range of 60:40 to 5:95.
Claim 3
Dependent Claim
20 words
A resistor composition as claimed in claim 1 in which said conductive particles consist of said coated RuO 2 particles.
Claim 4
Dependent Claim
28 words
A resistor composition as claimed in claim 1 in which said conductive particles consist of a mixture of uncoated RuO 2 particles and said coated RuO 2 particles.
Claim 5
Dependent Claim
34 words
A resistor composition as claimed in claim 1 containing up to 20 wt. % based on the combined weight of said conductive particles and said glass frit, of one or more metal oxide additives.
Claim 6
Dependent Claim
38 words
A resistor composition as claimed in claim 4 in which said metal oxide additives are selected from the group consisting of copper oxide, manganese oxide, lanthanum oxide, neodymium oxide, samarium oxide, praseodymium oxide, alumina, silica, and niobium oxide.
Claim 7
Dependent Claim
28 words
A resistor composition as claimed in claim 1, which also contains conductive particles of at least one metal selected from the group consisting of Ag, Au and Pd.
Claim 8
Dependent Claim
68 words
A resistor composition as claimed in claim 1, in which said glass frit has a particle size of not larger than 10 micrometers, said coated RuO 2 particles have a specific surface area of from about 5 to about 60 m 2 /g, and the amount of the polynary oxide coating is from 1-25 mol %, with respect to the total amount of said coated RuO 2 particles.
Claim 9
Dependent Claim
64 words
A resistor composition as claimed in claim 1, in which said coated RuO 2 particles have been prepared by coating the surfaces of RuO 2 particles with compounds of said metal component and then calcining said coated RuO 2 particles at 700° to 900° C., for from 1 to 10 hours, in an oxidizing atmosphere to convert the coating to said polynary oxide coating.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-03 | 1989-09-02 | 1990-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-03 | 1993-09-02 | 1994-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-03 | 1997-09-02 | 1998-03-04 | $7700.00 | Window Closed / Lapsed |