US4359872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low temperature regenerators for cryogenic coolers
Assignee: Philips North America LLC
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Filing: 1981-09-15
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Granted: 1982-11-23
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Expires: 2001-09-15
Abstract
Abstract A regenerator for a closed thermodynamic cycle cryogenic cooler is made of a vessel containing helium. The helium may be contained in, for example, hollow glass spheres or hollow metal tubing. The pressure of the helium in the vessel and the size of the regenerator are chosen to assure that the mass of helium in the regenerator exceeds the mass of helium in the working gas which passes through the regenerator in the operation of the cooler. Closed thermodynamic cycles in which the helium-containing regenerators can be used include the Stirling cycle and the Vuilleumier cycle.
Inventors
- 👤 Michael P. Goldowsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:17
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/044; F02G1/0445; F02G2250/00; F02G2250/18; F25; F25B; F25B2309/00; F25B2309/003
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
70 words
A regenerator, for a closed thermodynamic cycle cooler, comprising: a cylindrical container having two open ends; a first porous plate closing one end of the container; a second porous plate, slidably mounted in the cylindrical container, closing the second end of the container; a plurality of hollow glass spheres containing helium in the container between the porous plates; and means for compressing the glass spheres between the two porous plates.
Claim 2
Dependent Claim
70 words
A regenerator, for a closed thermodynamic cycle cooler, comprising: a cylindrical container having two open ends; a first porous plate closing one end of the container; a second porous plate, slidably mounted in the cylindrical container, closing the second end of the container; a plurality of hollow glass spheres containing helium in the container between the porous plates; and means for compressing the glass spheres between the two porous plates.
Claim 3
Dependent Claim
31 words
A regenerator as claimed in claim 1, characterized in that the first porous plate is attached to the cylindrical container and the second porous plate is spring-biased toward the first plate.
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) | 1985-11-22 | 1986-05-24 | 1986-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-22 | 1990-05-24 | 1990-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-22 | 1994-05-24 | 1994-11-23 | $7700.00 | Window Closed / Lapsed |