Patent US4558570A successfully refreshed from Google Patents.
US4558570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compressor unit in split cycle cryogenic coolers
Assignee: Individual
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Filing: 1983-07-08
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Granted: 1985-12-17
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Expires: 2003-07-08
Abstract
Abstract A split cycle cryogenic cooler system of the Stirling split type comprises a compressor which is positioned in a sealed casing, the drive for the compressor being constituted by an electro-motor positioned outside the casing, magnetic torque coupling transmitting rotational movement from the motor to the piston of the compressor via a crankshaft.
Inventors
- 👤 Shmuel Shtrikman
- 👤 Menachem Danziger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:39
CPC Classifications
F; F25; F25B; F25B31/00; F25B31/02; F25B31/023; H; H02; H02K; H02K7/00; H02K7/10; H02K7/11
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
108 words
In a cryogenic cooler system of the Stirling split type comprising a casing, a compressor unit sealed into said casing, said compressor unit including a crankshaft, and a piston, and said crankshaft connected to said piston for supplying linear movement thereto, an electromotor positioned outside of said casing and forming the drive for said compressor unit, said electromotor including a shaft, magnetic coupling means being provided transmitting rotational movement from the shaft of the electromotor to said crankshaft, said electromotor has a part of said shaft extending from the motor casing opposite the magnetically coupled shaft end, and a fan mounted on said extending part of said shaft.
Claim 2
Dependent Claim
108 words
In a cryogenic cooler system of the Stirling split type comprising a casing, a compressor unit sealed into said casing, said compressor unit including a crankshaft, and a piston, and said crankshaft connected to said piston for supplying linear movement thereto, an electromotor positioned outside of said casing and forming the drive for said compressor unit, said electromotor including a shaft, magnetic coupling means being provided transmitting rotational movement from the shaft of the electromotor to said crankshaft, said electromotor has a part of said shaft extending from the motor casing opposite the magnetically coupled shaft end, and a fan mounted on said extending part of said shaft.
Claim 3
Dependent Claim
38 words
The arrangement claimed in claim 1, characterised thereby that the said magnetic coupling is of the reentrant type with said casing having a recessed portion aligned with said electromotor shaft and said shaft extending into said recessed portion.
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) | 1988-12-16 | 1989-06-17 | 1989-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-16 | 1993-06-17 | 1993-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-16 | 1997-06-17 | 1997-12-17 | $7700.00 | Window Closed / Lapsed |