Patent US4412423A successfully refreshed from Google Patents.
US4412423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Split-cycle cooler with improved pneumatically-driven cooling head
Assignee: United States Department of the Army
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Filing: 1982-06-16
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Granted: 1983-11-01
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Expires: 2002-06-16
Abstract
Abstract A pneumatic space and an expansion space are provided in a cooling head hng a double-ended piston. A fluid line from the cooler compressor feeds directly into the expansion space, and, via a fluid delay, into the pressure space. In response to the fluid pressure waves in the lines, the piston is first moved in one direction by fluid in the expansion space and in the opposite direction by fluid in the pneumatic space.
Inventors
- 👤 Peter Durenec
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:23
CPC Classifications
F; F25; F25B; F25B9/00; F25B9/14; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/0435
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
127 words
A split-cycle cryogenic cooler system including a compressor which provides a pressure wave in said system, a displacer piston assembling, a cryogenic fluid conduit means between said compressor and said assembly, with a cryogenic fluid in said compressor, said assembly, and said conduit means, wherein the improvement comprise: said displacer piston assembly has an expansion space and pneumatic space in communication with said fluid conduit means, wherein said fluid conduit means includes: first and second fluid conduits respectively connected to said expansion space and to said pneumatic space to conduct respectively first and second portions of said pressure wave; a fluidic delay in said first fluid conduit whereby said first portion of said pressure wave leads in time or phase the second portion of said pressure wave.
Claim 2
Dependent Claim
127 words
A split-cycle cryogenic cooler system including a compressor which provides a pressure wave in said system, a displacer piston assembling, a cryogenic fluid conduit means between said compressor and said assembly, with a cryogenic fluid in said compressor, said assembly, and said conduit means, wherein the improvement comprise: said displacer piston assembly has an expansion space and pneumatic space in communication with said fluid conduit means, wherein said fluid conduit means includes: first and second fluid conduits respectively connected to said expansion space and to said pneumatic space to conduct respectively first and second portions of said pressure wave; a fluidic delay in said first fluid conduit whereby said first portion of said pressure wave leads in time or phase the second portion of said pressure wave.
Claim 3
Dependent Claim
32 words
The system as defined in claim 1 wherein said displacer piston assembly has a double-ended piston therein, with one end in said pneumatic space and the other end in said expansion space.
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) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |