US3620840A
Expired / Lapsed
US
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Resistance material and resistance elements made therefrom
Assignee: Methode Development Co
•
Filing: 1968-12-13
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Granted: 1971-11-16
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Expires: 1988-12-13
Abstract
Abstract Improved material for forming resistance elements using minute amounts of noble metals in finely divided form together principally with finely divided vitreous binder material; and resistance elements made from such material.
Inventors
- 👤 Duane Arthur Schroeder
- 👤 E Dundee
- 👤 Alvin Dennis Weiss
- 👤 Benedict Clare Giltner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:24
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06526
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
16 words
The material of claim 1 wherein the vitreous binder material comprises a combination of borosilicate glasses.
Claim 2
Dependent Claim
19 words
The material of claim 1 wherein at least one of the noble metals is provided by an organometal complex.
Claim 3
Dependent Claim
11 words
The material of claim 1 wherein the noble metal comprises ruthenium.
Claim 4
Dependent Claim
13 words
The material of claim 1 wherein the noble metals comprise ruthenium and rhodium.
Claim 5
Dependent Claim
18 words
The material of claim 1 wherein there is included a small amount of at least one doping agent.
Claim 6
Dependent Claim
12 words
The material of claim 6 wherein the doping agent comprises a metal.
Claim 7
Dependent Claim
11 words
The material of claim 7 wherein the doping agent comprises copper.
Claim 8
Dependent Claim
11 words
The material of claim 7 wherein the doping agent comprises nickel.
Claim 9
Dependent Claim
19 words
The material of claim 7 wherein the doping agent comprises copper and the noble metals comprise ruthenium and rhodium.
Claim 10
Dependent Claim
17 words
The material of claim 7 wherein the doping agent comprises nickel and the noble metal comprises ruthenium.
Claim 11
Dependent Claim
12 words
The material of claim 6 wherein the doping agent includes a nonmetal.
Claim 12
Dependent Claim
11 words
The material of claim 12 wherein the doping agent comprises silica.
Claim 13
Dependent Claim
19 words
The material of claim 12 wherein the doping agents comprise silica and nickel and the noble metal comprises ruthenium.
Claim 14
Dependent Claim
54 words
A resistance element comprising a high-temperature-resistance, electrically nonconductive base having fired on it a layer of resistance material consisting essentially of solidified nonconductive vitreous material and at least one noble metal totaling less than 0.5 percent by weight dispersed through the solidified vitreous material in a manner to provide controlled flow of electrical current.
Claim 15
Dependent Claim
14 words
The resistance element of claim 15 wherein the noble metals comprise ruthenium and rhodium.
Claim 16
Dependent Claim
16 words
The resistance element of claim 15 together with at least one nonnoble metal in small amounts.
Claim 17
Dependent Claim
20 words
The resistance element of claim 17 wherein the nonnoble metal comprises copper and the noble metals comprise ruthenium and rhodium.
Claim 18
Dependent Claim
13 words
The resistance element of claim 17 together with a nonmetal in small amounts.
Claim 19
Dependent Claim
22 words
The resistance element of claim 19 wherein the nonmetal comprises silica, the nonnoble metal comprises nickel and the noble metal comprises ruthenium.
Claim 20
Dependent Claim
89 words
A resistance composition with which a base may be coated in desired pattern and when fired produce stable resistor films having a controlled ohmic value per square between 5K ohms and 10 megohms and characterized by low temperature coefficients of resistance and low noise values relative to their resistance levels, said composition consisting essentially of finely divided nonconducting glass frit containing a minute quantity of one or more finely divided noble metals including ruthenium, the total quantity of noble metal being less than 0.5 by weight of the composition.
Claim 21
Dependent Claim
20 words
The resistance composition of Claim 21 wherein the minute quantity of noble metals comprises rhodium in addition to the ruthenium.
References Cited (Backward Citations)
GB989296A
Cited
US3248345A
Cited
US3352797A
Cited
US3329526A
Cited
US3440182A
Cited
US3324049A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |