Patent JPS5848432A successfully refreshed from Google Patents.
US3704601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryogenic cooling apparatus
Assignee: The Hymatic Engineering Co Ltd
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Filing: 1970-03-23
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Granted: 1972-12-05
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Expires: 1990-03-23
Abstract
Abstract Cryogenic cooling apparatus including a heat exchanger affording two paths through one of which refrigerant gas from a supply under pressure is supplied to a pressure reducing nozzle, whereupon the low pressure refrigerant returns through the other path, a valve member controlled by a bellows and co-operating with the nozzle to vary its effective area for automatically controlling the flow of refrigerant. To give ''''fail open'''' operation the valve is subject to the vapor pressure of a material which falls below the ambient pressure in the apparatus as its temperature falls and the demand for cooling drops, and arranged so that the resulting suction will then tend to close the valve against the said bias.
Inventors
- 👤 David Nell Campbell
- 👤 Frank Arnold Turton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:34
CPC Classifications
F; F25; F25J; F25J1/00; F25J1/02; F25J1/0243; F25J1/0257; F25J1/0275; F25J1/0276; F25B; F25B9/00; F25B9/02; F25B2309/00; F25B2309/02; F25B2309/022; F25J2290/00; F25J2290/42
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
163 words
Cryogenic cooling apparatus, comprising; an insulating housing, a heat exchanger mounted within said housing, a cooling chamber formed within said housing, pressure reducing valve means mounted within said housing for regulating the flow of a refrigerant to said cooling chamber, said heat exchanger including a first path for conveying said refrigerant to said valve means from a supply source and a second path for conveying refrigerant under reduced pressure, pressure regulating means responsive to the vapor pressure of a substance therein which is less than the ambient pressure within said apparatus and including means communicating with said cooling chamber for sensing the temperature thereof and further including means for biasing said valve means in an open position, and means connecting said pressure regulating means to said valve means to vary the opening of said valve means for automatically controlling the flow of refrigerant to said cooling chamber by tending to close said valve in accordance with the suction within said pressure regulating means.
Claim 2
Dependent Claim
163 words
Cryogenic cooling apparatus, comprising; an insulating housing, a heat exchanger mounted within said housing, a cooling chamber formed within said housing, pressure reducing valve means mounted within said housing for regulating the flow of a refrigerant to said cooling chamber, said heat exchanger including a first path for conveying said refrigerant to said valve means from a supply source and a second path for conveying refrigerant under reduced pressure, pressure regulating means responsive to the vapor pressure of a substance therein which is less than the ambient pressure within said apparatus and including means communicating with said cooling chamber for sensing the temperature thereof and further including means for biasing said valve means in an open position, and means connecting said pressure regulating means to said valve means to vary the opening of said valve means for automatically controlling the flow of refrigerant to said cooling chamber by tending to close said valve in accordance with the suction within said pressure regulating means.
Claim 3
Dependent Claim
34 words
Apparatus as claimed in claim 1 in which said pressure regulating means comprises a chamber and a bellows mounted therein and said bias is provided at least partly by the resilience of said bellows.
Claim 4
Dependent Claim
29 words
Apparatus as claimed in claim 1 wherein said refrigerant is a liquified gas at a temperature of about 80*K and said substance within said pressure regulating means comprises methane.
Claim 5
Dependent Claim
47 words
Apparatus as claimed in claim 1 in which said pressure regulating means is mounted externally to said housing at an extremity thereof opposite said cooling chamber and said means connecting said pressure regulating means and said valve means comprises a piston rod extending through said heat exchanger.
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) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |