US3639274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical resistance composition
Assignee: Allen Bradley Co LLC
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Filing: 1967-09-06
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Granted: 1972-02-01
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Expires: 1987-09-06
Abstract
Abstract An electrical resistance composition comprising finely divided metals such as the noble metals dispersed in a glass matrix and further including an additive taken from the group consisting of gallium, indium, thallium, arsenic, antimony, bismuth and combinations thereof so as to improve the electrical properties of the composition-particularly the TCR.
Inventors
- 👤 Ivan L Brandt
- 👤 Orville R Penrod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:31
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06553; C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089; H01C17/06526
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
11 words
a glass comprising 40-91.95 percent by weight of the fired solids.
Claim 2
Dependent Claim
29 words
The electrical resistance composition of claim 1 wherein said constituent is bismuth in the proportion greater than 1.8 but less than 5 percent by weight of the fired solids.
Claim 3
Dependent Claim
37 words
25-70 percent silver, and b. a flux comprising up to about 5.0 percent by weight of the fired solids of a constituent taken from the group consisting of gallium, iridium, thallium, arsenic, and bismuth and combinations thereof.
Claim 4
Dependent Claim
26 words
The electrical resistance composition of claim 1 wherein said constituent is indium in the proportion 0.05 percent to 1 percent by weight of the fired solids.
Claim 5
Dependent Claim
52 words
The electrical composition of claim 1 wherein: a. said finely divided metals are taken from the group consisting of palladium, gold, silver, rhodium and combinations thereof, and b. said glass is taken from the group consisting of lead borosilicate glass frit, zinc borosilicate glass frit, barium borosilicate glass frit and combinations thereof.
Claim 6
Dependent Claim
33 words
A resIstor composition adapted to be applied to and fired on a ceramic body comprising: a. the metals palladium and silver between 8 and 55 percent by weight of the fired solids having,
Claim 7
Dependent Claim
13 words
The electrical resistance composition of claim 5 in which said constituent is bismuth.
Claim 8
Dependent Claim
18 words
The electrical resistance of claim 6 in which said bismuth constituent is in the form of bismuth oxide.
Claim 9
Dependent Claim
13 words
The electrical resistance composition of claim 5 in which said constituent is indium.
Claim 10
Dependent Claim
15 words
The electrical resistance composition of claim 5 in which said constituent is bismuth and indium.
Claim 11
Dependent Claim
98 words
A fired electrical resistance composition of a substrate comprising: a. metals taken from the group consisting of the noble metals palladium, gold, silver, rhodium, ruthenium, iridium and combinations thereof, which metals comprise 8-55 percent by weight of the composition solids, b. a constituent to improve the Temperature Coefficient of Resistance of said composition and comprising greater than 0.05 but less than 5 percent by weight of the composition solids and taken from the group consisting of gallium, indium, thallium, arsenic, bismuth and combinations thereof, and a ceramic matrix which comprises 40-91.95 percent by weight of the composition solids.
Claim 12
Dependent Claim
50 words
The electrical resistance composition of claim 10 wherein: a. said metals are taken from the group consisting of palladium, gold, silver, rhodium and combinations thereof, and b. said ceramic matrix is taken from the group consisting of solidified lead borosilicate glass, zinc borosilicate glass, barium borosilicate glass and combinations thereof.
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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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |