Patent US4812801A successfully refreshed from Google Patents.
US4812801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state gas pressure sensor
Assignee: United States Department of the Air Force
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Filing: 1987-05-14
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Granted: 1989-03-14
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Expires: 2007-05-14
Abstract
Abstract A solid state gas pressure sensor has a resistor of polysilicon deposited upon a dielectric substrate which electrically isolates and thermally prevents heat transfer to other devices thereon. A constant voltage is applied to the resistor. Depending upon the gas pressure over the sensor, a given current will be output once temperature equilibrium is established. A change in the gas pressure changes the output current of the resistor. The output current indicative of pressure is temperature corrected.
Inventors
- 👤 James Halvis
- 👤 Nathan Bluzer
- 👤 Robert Shiskowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:12
CPC Classifications
G; G01; G01L; G01L21/00; G01L21/10; G01L21/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
92 words
A solid state gas pressure sensor, said gas pressure sensor comprising: a means for producing heat in response to current flow at a fixed voltage such that said current flow changes as a direct result of changing gas density thereabout, said means for producing heat being an integrated circuit device, a non-flexing means for holding said means for producing heat, said non-flexing means being an electrical insulator and a thermal barrier, said non-flexing means being mounted on a housing, and electrical contacts, said electrical contacts attached to said means for producing heat.
Claim 2
Dependent Claim
92 words
A solid state gas pressure sensor, said gas pressure sensor comprising: a means for producing heat in response to current flow at a fixed voltage such that said current flow changes as a direct result of changing gas density thereabout, said means for producing heat being an integrated circuit device, a non-flexing means for holding said means for producing heat, said non-flexing means being an electrical insulator and a thermal barrier, said non-flexing means being mounted on a housing, and electrical contacts, said electrical contacts attached to said means for producing heat.
Claim 3
Independent Claim
101 words
A method of measuring gas pressure, said method comprising the steps of: applying a fixed voltage to a heat producing means that has gas thereabout, allowing said heat producing means to reach thermodynamic equilibrium; measuring a current from said heat producing means when said equilibrium is reached, the current being indicative of a gas pressure of the gas thereabout; measuring the temperature of an ambient gas about said heat producing means while in equilibrium, said temperature being independent of said heat producing means; and correcting the gas pressure measured by said heat producing means for the temperature of said ambient gas.
Claim 4
Independent Claim
101 words
A method of measuring gas pressure, said method comprising the steps of: applying a fixed voltage to a heat producing means that has gas thereabout, allowing said heat producing means to reach thermodynamic equilibrium; measuring a current from said heat producing means when said equilibrium is reached, the current being indicative of a gas pressure of the gas thereabout; measuring the temperature of an ambient gas about said heat producing means while in equilibrium, said temperature being independent of said heat producing means; and correcting the gas pressure measured by said heat producing means for the temperature of said ambient gas.
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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) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |