Patent US3105790A successfully refreshed from Google Patents.
Patent US3933000A successfully refreshed from Google Patents.
US3933000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular regenerator for a cryogenic refrigerator
Assignee: United States Department of the Air Force
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Filing: 1975-02-06
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Granted: 1976-01-20
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Expires: 1995-02-06
Abstract
Abstract The hot cylinder for a Vuilleumier cycle cryogenic refrigerator having an annular liner positioned between the hot displacer and the hot-cylinder wall with a plurality of stainless steel tubes in the space between the liner and the hot-cylinder wall to form a hot regenerator. The liner axially supports the tubes and has air flow notches at the top and bottom thereof. The gas flows through the tubes and through the spaces between the tubes. An annular seal is provided between the hot displacer and the annular liner.
Inventors
- 👤 Richard D. Doody
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:45
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/044; F02G1/0445; F02G2250/00; F02G2250/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
155 words
A hot cylinder for a cryogenic refrigerator having a hot displacer in the hot cylinder; a cold cylinder inclosing a cold displacer; a crankcase connected to the hot cylinder and the cold cylinder, a motor for moving the hot displacer and the cold displacer and a heater for said hot cylinder comprising: a cylindrical wall member adapted to be secured to said crankcase; an annular liner member positioned between the hot displacer and said wall member and spaced a predetermined distance from said wall member; a plurality of elongated tubular members in the space between the wall member and the liner member; said liner member including means for axially positioning the tubular members; means for providing a seal between said hot displacer and said liner member; said liner member including means for providing a gas flow path between the crankcase through said tubular members into a hot volume adjacent the heater in the hot cylinder.
Claim 2
Dependent Claim
155 words
A hot cylinder for a cryogenic refrigerator having a hot displacer in the hot cylinder; a cold cylinder inclosing a cold displacer; a crankcase connected to the hot cylinder and the cold cylinder, a motor for moving the hot displacer and the cold displacer and a heater for said hot cylinder comprising: a cylindrical wall member adapted to be secured to said crankcase; an annular liner member positioned between the hot displacer and said wall member and spaced a predetermined distance from said wall member; a plurality of elongated tubular members in the space between the wall member and the liner member; said liner member including means for axially positioning the tubular members; means for providing a seal between said hot displacer and said liner member; said liner member including means for providing a gas flow path between the crankcase through said tubular members into a hot volume adjacent the heater in the hot cylinder.
Claim 3
Dependent Claim
28 words
The device as recited in claim 1 wherein said means for axially positioning the tubular member is an annular channel in the outer wall of the annular liner.
Claim 4
Dependent Claim
74 words
The device as recited in claim 2 wherein said cylindrical wall member includes an offset for retaining said liner in place against the wall of said crankcase; said means for providing a gas flow path from the crankcase through said tubular members and into the hot volume includes a plurality of notches in the liner adjacent the crankcase and a plurality of notches in the liner adjacent the offset in the cylindrical wall member.
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) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |