Patent US4002500A successfully refreshed from Google Patents.
US4002500A
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US
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Thermocouple extension wire
Assignee: Wilbur B Driver Co
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Filing: 1975-07-31
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Granted: 1977-01-11
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Expires: 1995-07-31
Abstract
Abstract A thermocouple extension wire composition comprising, as expressed in percent by weight, nickel 0.5% - 1.5%; manganese 0.25% - 0.4%; balance copper. A pair of thermocouple extension wires, one wire having the above composition, the other wire being composed essentially of copper, exhibit a differential electromotive force substantially equal to the electromotive force developed by a thermocouple using noble metals principally of platinum between 32° F to 400° F.
Inventors
- 👤 Teh Po Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:47
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/02; G01K7/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
62 words
A negative thermocouple extension wire composition for use with a positive copper thermocouple extension wire in a Platinum/Platinum-Rhodium thermocouple system wherein the positive thermoelement of the system is a Platinum-Rhodium alloy selected from the group consisting of Platinum-10 percent Rhodium and Platinum-13 percent Rhodium, the composition consisting essentially of in percent by weight: ______________________________________
Nickel 0.5-1.5%
Manganese 0.25-0.40%; and
Copper Balance
______________________________________
Claim 2
Dependent Claim
62 words
A negative thermocouple extension wire composition for use with a positive copper thermocouple extension wire in a Platinum/Platinum-Rhodium thermocouple system wherein the positive thermoelement of the system is a Platinum-Rhodium alloy selected from the group consisting of Platinum-10 percent Rhodium and Platinum-13 percent Rhodium, the composition consisting essentially of in percent by weight: ______________________________________
Nickel 0.5-1.5%
Manganese 0.25-0.40%; and
Copper Balance
______________________________________
Claim 3
Dependent Claim
28 words
The composition of claim 1 further including small additions of deoxidizers selected from the group consisting of 0.01% boron, 0.02 to 0.04% magnesium, and 0.03 to 0.05% silicon.
Claim 4
Dependent Claim
16 words
The composition of claim 2 wherein the nickel content is from 0.75 to 1.25% by weight.
References Cited (Backward Citations)
US2183592A
Cited
US1468456A
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US2224573A
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US2335707A
Cited
US3337371A
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US3372062A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |