US3672218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for measuring temperature of a cryogenic environment
Assignee: United States Department of the Army
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Filing: 1971-01-26
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Granted: 1972-06-27
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Expires: 1991-01-26
Abstract
Abstract A system for measuring the temperature of a cryogenic environment including an RC circuit provided with a source of reference voltage with a resistance sensor disposed within the environment and connected to a trigger. A pulser is connected to supply the RC circuit and a temperature indicator is connected to a pulser and trigger to count the RC interval for determination of the temperature of the environment.
Inventors
- 👤 Richard L Hartman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:31
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/16; G01K7/18; G01K7/20; G01K7/203
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
82 words
A system for measuring the temperature of a cryogenic environment comprising: a resistor-capacitor (RC) circuit having a temperature-responsive resistor disposed within the environment and connected between a trigger and a pulser which supplies power to the RC circuit; an indigenous source of reference voltage, said trigger responding to a voltage across the RC circuit equal to said reference voltage, and a temperature indicator connected to the pulser and trigger to count the RC interval for determination of the temperature of the environment.
Claim 2
Independent Claim
82 words
A system for measuring the temperature of a cryogenic environment comprising: a resistor-capacitor (RC) circuit having a temperature-responsive resistor disposed within the environment and connected between a trigger and a pulser which supplies power to the RC circuit; an indigenous source of reference voltage, said trigger responding to a voltage across the RC circuit equal to said reference voltage, and a temperature indicator connected to the pulser and trigger to count the RC interval for determination of the temperature of the environment.
Claim 3
Dependent Claim
25 words
A system as defined in claim 1 with said source of reference voltage comprising a grounded variable potentiometer connected between said pulser and said trigger.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |