US4011538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid sensor
Assignee: Illinois Tool Works Inc
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Filing: 1976-01-30
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Granted: 1977-03-08
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Expires: 1996-01-30
Abstract
Abstract A low-cost fluid sensor which has a controlled resistance value is provided by depositing a resistance material between two electrodes on a portion of a molecular sieve layer. A heating resistor for drying out the fluid sensor may also be provided by depositing a resistance strip over another portion of the molecular sieve layer, or alternately by providing the resistance strip adjacent the molecular sieve layer on a supporting substrate.
Inventors
- 👤 John G. Froemel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:08
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/121
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
34 words
A fluid sensor comprising a molecular sieve layer, first and second spaced-apart electrodes and a resistance material deposited on said layer so as to make an electrical connection between said first and second electrodes.
Claim 2
Dependent Claim
34 words
A fluid sensor comprising a molecular sieve layer, first and second spaced-apart electrodes and a resistance material deposited on said layer so as to make an electrical connection between said first and second electrodes.
Claim 3
Dependent Claim
13 words
A fluid sensor as claimed in claim 1 further comprising a heating resistor.
Claim 4
Dependent Claim
31 words
A fluid sensor as claimed in claim 2 further comprising a supporting substrate for said layer wherein said electrodes, said substrate and said heating resistor are all formed of heat-resistance compositions.
Claim 5
Dependent Claim
20 words
A fluid sensor as claimed in claim 2 wherein said heating resistor is deposited on a portion of said layer.
Claim 6
Dependent Claim
21 words
A fluid sensor as claimed in claim 3 wherein said heating resistor is disposed intermediate said layer and said supporting substrate.
Claim 7
Dependent Claim
28 words
A fluid sensor as claimed in claim 3 wherein said heating resistor is disposed on a different surface of said supporting substrate than is said molecular sieve layer.
Claim 8
Dependent Claim
16 words
A fluid sensor as claimed in claim 1 wherein said fluid sensor is a humidity sensor.
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) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |