US4004948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paint-on thermocouple
Assignee: United States Department of the Navy
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Filing: 1975-05-29
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Granted: 1977-01-25
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Expires: 1995-05-29
Abstract
Abstract Thermocouples are fabricated by painting lines of two dissimilar thermal-ment materials on a non-conducting substrate such that the painted lines intersect at the location where temperature is to be measured. Alternatively the paint may be thinned to the consistancy of ink and used in a printing process. Thermocouples may be thus formed on paper, cloth or plastic surfaces, for example.
Inventors
- 👤 Warren K. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:00
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/16; G01K7/22; G01K7/223; G01K1/00; G01K1/14; G01K1/143; G01K7/02; G01K7/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
83 words
The method of making a thermocouple on a surface to be tested comprising: mixing two electrically dissimilar metals in finely divided form each with a liquid vehicle and a liquid dryer to obtain two fluid mixtures each having a desired fluid consistency; applying a narrow film of each mixture so obtained on said surface along diverging lines intersecting in a relatively small area and terminating at two accessible points remote from said area; and drying said lines of narrow film at ambient temperature.
Claim 2
Independent Claim
83 words
The method of making a thermocouple on a surface to be tested comprising: mixing two electrically dissimilar metals in finely divided form each with a liquid vehicle and a liquid dryer to obtain two fluid mixtures each having a desired fluid consistency; applying a narrow film of each mixture so obtained on said surface along diverging lines intersecting in a relatively small area and terminating at two accessible points remote from said area; and drying said lines of narrow film at ambient temperature.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein one mixture comprises the metal alloy constantan.
Claim 4
Dependent Claim
12 words
The method of claim 2 wherein the other mixture comprises metallic silver.
Claim 5
Dependent Claim
30 words
The method of claim 3 wherein said one mixture further comprises 11/2 to 3% nitro-cotton in butyl-acetate and said mixture being thinned to the desired consistency with a toluol dryer.
Claim 6
Dependent Claim
16 words
The method of claim 2 wherein the vehicle of said one mixture comprises nitro-cotton in butyl-acetate.
Claim 7
Dependent Claim
28 words
The method of claim 1 wherein said supporting surface is conductive and a non-conductive coating is applied to said surface before application of said diverging lines of paint.
Claim 8
Dependent Claim
72 words
A thermocouple comprising: a non-conductive substrate; a first thin narrow strip of metallic film on said substrate; and a thin narrow strip of a second, dissimilar, metallic film intersecting and electrically contacting said first strip; said first metallic film being a paint containing a finely divided metal selected from the group consisting of: silver, platinum, gold and lead; and said second strip being a paint having a pigment consisting essentially of constantan.
Claim 9
Dependent Claim
72 words
A thermocouple comprising: a non-conductive substrate; a first thin narrow strip of metallic film on said substrate; and a thin narrow strip of a second, dissimilar, metallic film intersecting and electrically contacting said first strip; said first metallic film being a paint containing a finely divided metal selected from the group consisting of: silver, platinum, gold and lead; and said second strip being a paint having a pigment consisting essentially of constantan.
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) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |