Multi-stage pulse tube with matched temperature profiles

Refrigeration – Gas compression – heat regeneration and expansion – e.g.,...

Reexamination Certificate

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Reexamination Certificate



Convection losses associated with different temperature profiles in the pulse tubes and regenerators of multi-stage pulse tubes mounted in helium gas in the neck tube of a MRI cryostat are reduced by providing one or more of thermal bridges, and/or insulating sleeves between one or more pulse tubes and regenerators, and/or spacers, and spacer tubes, in one or more pulse tubes and regenerators.

patent: 2782465 (1957-02-01), Palmer, Jr.
patent: 3119237 (1964-01-01), Gifford
patent: 3237421 (1966-03-01), Gifford
patent: 4192352 (1980-03-01), Hakamada et al.
patent: 4293607 (1981-10-01), Millgardh et al.
patent: 4484458 (1984-11-01), Longsworth
patent: 4606201 (1986-08-01), Longsworth
patent: 5107683 (1992-04-01), Chan et al.
patent: 5295355 (1994-03-01), Zhou et al.
patent: 5412952 (1995-05-01), Ohtani et al.
patent: 5522223 (1996-06-01), Yanai et al.
patent: 5613365 (1997-03-01), Mastrup et al.
patent: 5680768 (1997-10-01), Rattray et al.
patent: 6256998 (2001-07-01), Gao
patent: 6378312 (2002-04-01), Wang
patent: 6619046 (2003-09-01), Mitchell
patent: 7047750 (2006-05-01), Mita et al.
patent: 7131276 (2006-11-01), Pan et al.
patent: 7173046 (2007-02-01), Zheng et al.
patent: 2003/0163996 (2003-09-01), Ravex
patent: 2004/0112065 (2004-06-01), Pan et al.
patent: 2005/0044860 (2005-03-01), Mita et al.
patent: 2005/0274124 (2005-12-01), Wang
patent: 2006/0144054 (2006-07-01), Xu et al.
patent: 2006/0242968 (2006-11-01), Mita et al.
patent: 1519518 (2004-08-01), None
patent: 1418388 (2004-05-01), None
patent: 7-260269 (1995-10-01), None
patent: 2001-248927 (2001-09-01), None
patent: 2001-263841 (2001-09-01), None
patent: 2001-272126 (2001-10-01), None
patent: 2003-75001 (2003-03-01), None
patent: 2003-532045 (2003-10-01), None
patent: 2004-286430 (2004-10-01), None
patent: WO 03/036190 (2003-05-01), None
patent: WO 03/036207 (2003-05-01), None
E.I. Mikulin et al. “Low-Temperature Expansion Pulse Tubes” Advances in Cryogenic Engineering, vol. 29, p. 629-637, 1984.
R.C. Longsworth “Early Pulse Tube Refrigerator Developments”, Cryocoolers 9, p. 261-268, 1997.
S. Zhu et al. “Double Inlet Pulse Tube Refrigerators: An Important Improvement” Cryogenics, vol. 30, p. 514, 1990.
Y. Matsubara et al. “An Experimental and Analytical Investigation of 4 K Pulse Tube Refrigerator” Proc. 7, Intl Cryocooler Conf., Air Force Report PL-(P-93-101), p. 166-186, 1993.
J.L. Gao et al. “Experimental Investigation of 4 K Pulse Tube Refrigerator” Cryogenics, vol. 34, p. 25, 1994.
L.W. Yang et al. “Research of Two-Stage Co-Axial Pulse Tube Coolers Driven by a Valveless Compressor” Cryocoolers 10, p. 233-238, 1999.
K. Yuan et al. “Experimental Investigation of a G-M Type Coaxial Pulse Tube Cryocooler”, Cryocoolers 12, p. 317-323, 2001.
Chinese Office Action dated Aug. 8, 2008, from the corresponding Chinese Application.
Japanese Office Action dated Jul. 22, 2008, from the corresponding Japanese Application.
Decision of Refusal dated Mar. 17, 2009, from the corresponding Japanese Application.


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