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US4501124A
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US
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Apparatus for leakage detection of cryogenic materials
Assignee: Shell USA Inc
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Filing: 1984-01-17
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Granted: 1985-02-26
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Expires: 2004-01-17
Abstract
Abstract A device for detecting leaks of cryogenic materials from a structure, said device comprising a heat-conductive element which can be brought into contact with the cryogenic material-containing structure, and a shape memory effect element capable of effecting a displacement according to the cryogenic temperature to which the element is subjected.
Inventors
- 👤 Edward B. Shone
- 👤 Robert W. Wilson
- 👤 Gordon L. Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:42
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/042; F; F17; F17C; F17C13/00; F17C13/12; G01M3/002; F17C2221/00; F17C2221/01; F17C2221/011; F17C2221/03; F17C2221/032; F17C2221/033; F17C2221/035; F17C2223/00; F17C2223/01; F17C2223/0146; F17C2223/0153; F17C2223/0161; F17C2223/03; F17C2223/033; F17C2250/00; F17C2250/03; F17C2250/036; F17C2260/00; F17C2260/03; F17C2260/035; F17C2260/038
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A device for detecting a leak of cryogenic material from a structure containing the material and triggering an alarm, the device comprising a heat-conductive element located to receive cryogenic material falling from the cryogenic material-containing structure, a biasing element made from a shape memory effect alloy which contacts the heat-conductive element and is operative to effect a displacement of the heat-conductive element according to the cryogenic temperature to which the biasing element is subjected, a housing provided with an opening which is closed in the absence of a leak of the cryogenic material onto the heat-conductive element, another opening in said housing for receiving pressurized fluid medium, and means for conveying a pressure drop signal from said housing to trigger an alarm.
Claim 2
Independent Claim
122 words
A device for detecting a leak of cryogenic material from a structure containing the material and triggering an alarm, the device comprising a heat-conductive element located to receive cryogenic material falling from the cryogenic material-containing structure, a biasing element made from a shape memory effect alloy which contacts the heat-conductive element and is operative to effect a displacement of the heat-conductive element according to the cryogenic temperature to which the biasing element is subjected, a housing provided with an opening which is closed in the absence of a leak of the cryogenic material onto the heat-conductive element, another opening in said housing for receiving pressurized fluid medium, and means for conveying a pressure drop signal from said housing to trigger an alarm.
References Cited (Backward Citations)
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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) | 1988-02-26 | 1988-08-27 | 1989-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-26 | 1992-08-27 | 1993-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-26 | 1996-08-27 | 1997-02-26 | $7700.00 | Window Closed / Lapsed |