US4332081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature sensor
Assignee: Philips North America LLC
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Filing: 1980-07-10
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Granted: 1982-06-01
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Expires: 2000-07-10
Abstract
Abstract A temperature sensor is constructed as a bridge circuit using thick film technology. Both thermistor and resistor thick film inks are applied to a substrate to form a bridge circuit for producing a highly sensitive and accurate indicator when a predetermined temperature has been reached. The resistor thick film circuit is laser scribed at a specific temperature value for greater accuracy.
Inventors
- 👤 Gaylord L. Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:32
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/16; G01K7/22; G01K7/223; H; H01; H01C; H01C17/00; H01C17/22; H01C17/24; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49085
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A method of adjusting the resistance of a temperature sensor comprising: printing a plurality of first resistive material films, at least one second resistive material film forming a thermistor and a plurality of conductive termination films on the surface of a non-conductive substrate in a partially overlapping pattern to provide an electrical network; firing said substrate to bond said films to said substrate and fix their properties; immersing said substrate having said fired, formed films in a liquid bath maintained at a precise temperature, said temperature being the exact temperature at which said temperature sensor is to be responsive; measuring the resistance through each of said resistive films while said films are in said bath; removing said substrate from said bath; trimming the resistance of at least one of said first resistive films to a precise resistance value.
Claim 2
Independent Claim
138 words
A method of adjusting the resistance of a temperature sensor comprising: printing a plurality of first resistive material films, at least one second resistive material film forming a thermistor and a plurality of conductive termination films on the surface of a non-conductive substrate in a partially overlapping pattern to provide an electrical network; firing said substrate to bond said films to said substrate and fix their properties; immersing said substrate having said fired, formed films in a liquid bath maintained at a precise temperature, said temperature being the exact temperature at which said temperature sensor is to be responsive; measuring the resistance through each of said resistive films while said films are in said bath; removing said substrate from said bath; trimming the resistance of at least one of said first resistive films to a precise resistance value.
References Cited (Backward Citations)
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Cited
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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) | 1985-05-31 | 1985-11-30 | 1986-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-31 | 1989-11-30 | 1990-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-31 | 1993-11-30 | 1994-06-01 | $7700.00 | Window Closed / Lapsed |