US3972740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermocouple with improved EMF stability
Assignee: Wilbur B Driver Co
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Filing: 1975-07-31
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Granted: 1976-08-03
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Expires: 1995-07-31
Abstract
Abstract A nickel-base thermocouple with improved EMF stability is described, the positive thermoelement of which is a nominal Ni/14.25Cr/1.45Si/.1Mg alloy and the negative thermoelement of which is a nominal Ni/4Si/.1Mg alloy.
Inventors
- 👤 Carrol Dean Starr
- 👤 Teh Po Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:09
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/02; G01K7/04; H; H10; H10N; H10N10/00; H10N10/80; H10N10/85; H10N10/851; H10N10/854
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
79 words
A thermocouple consisting essentially of a positive thermoelement wire and a negative thermoelement wire metallurgically joined together, the positive thermoelement wire consisting essentially of an alloy of from about 13.75 to 14.75 weight percent Cr, about 1.25 to 1.75 weight percent Si, about .05 to 0.15 weight percent Mg, balance Ni, and the negative thermoelement wire consisting essentially of an alloy of from about 3.75 to 4.25 weight percent Si, about 0.10 to 0.20 weight percent Mg, balance Ni.
Claim 2
Dependent Claim
79 words
A thermocouple consisting essentially of a positive thermoelement wire and a negative thermoelement wire metallurgically joined together, the positive thermoelement wire consisting essentially of an alloy of from about 13.75 to 14.75 weight percent Cr, about 1.25 to 1.75 weight percent Si, about .05 to 0.15 weight percent Mg, balance Ni, and the negative thermoelement wire consisting essentially of an alloy of from about 3.75 to 4.25 weight percent Si, about 0.10 to 0.20 weight percent Mg, balance Ni.
Claim 3
Dependent Claim
39 words
The thermocouple of claim 1 wherein the positive thermoelement wire consists essentially of an alloy of from about 14.00 to 14.50 weight percent Cr, about 1.35 to 1.65 weight percent Si, 0.08 to 0.12 weight percent Mg, balance Ni.
Claim 4
Dependent Claim
28 words
The thermocouple of claim 2 wherein the negative thermoelement wire consists essentially of an alloy of about 4 weight percent Si, about 0.15 weight percent Mg, balance Ni.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |