US3813629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature compensated fluid level sensor
Assignee: GTE Sylvania Inc
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Filing: 1973-01-05
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Granted: 1974-05-28
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Expires: 1993-01-05
Abstract
Abstract There is described an apparatus for detecting the presence or absence of fluid. The apparatus comprises an electrical circuit and a sensor device electrically joined to the circuit. The sensor device comprises a housing member defining a first chamber, a tip member secured to the housing and forming a second chamber adjacent said first chamber, a diaphragm member forming a common closure for both chambers, heating means within the second chamber, a first contact within the first chamber, and a second contact affixed to the diaphragm also within the first chamber. This second contact is adapted for engaging the first contact when the temperature difference between the two chambers exceeds a predetermined level.
Inventors
- 👤 N Szeverenyi
- 👤 D Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:30
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/24; G01F23/246; G01F23/247
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
121 words
A sensor device comprising: a housing member defining a first chamber; a tip member secured to said housing and forming a second chamber adjacent said first chamber, said tip member adapted for being exposed to a fluid and for preventing entrance of said fluid into said second chamber; a diaphram member secured to said housing and forming a common closure for said first and second chambers; heater means within said second chamber in heat conductive relationship to said tip member; a first contact member within said first chamber, and a second contact member affixed to said diaphram within said first chamber for engaging said first contact member when the temperature difference between said first and second chambers exceeds a predetermined level.
Claim 2
Dependent Claim
121 words
A sensor device comprising: a housing member defining a first chamber; a tip member secured to said housing and forming a second chamber adjacent said first chamber, said tip member adapted for being exposed to a fluid and for preventing entrance of said fluid into said second chamber; a diaphram member secured to said housing and forming a common closure for said first and second chambers; heater means within said second chamber in heat conductive relationship to said tip member; a first contact member within said first chamber, and a second contact member affixed to said diaphram within said first chamber for engaging said first contact member when the temperature difference between said first and second chambers exceeds a predetermined level.
Claim 3
Dependent Claim
16 words
The sensor device according to claim 1 including a heater means for heating said first chamber.
Claim 4
Dependent Claim
15 words
The sensor according to claim 1 including a thermally conductive member within said first chamber.
Claim 5
Dependent Claim
20 words
The sensor device according to claim 1 wherein said heater means within said second chamber is an electrical resistive element.
Claim 6
Dependent Claim
20 words
The sensor device according to claim 2 wherein said heater means within said first chamber is an electrically resistive element.
Claim 7
Dependent Claim
15 words
The sensor device according to claim 3 wherein said thermally conductive member is electrically conductive.
Claim 8
Dependent Claim
14 words
The sensor device according to claim 1 wherein said tip member is electrically conductive.
Claim 9
Dependent Claim
18 words
The sensor device according to claim 1 wherein said diaphram member secured to said housing is electrically conductive.
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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |