The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 06, 1991
Filed:
Jan. 18, 1990
Applicant:
Inventor:
Ronald N Morris, Newtonville, MA (US);
Assignee:
Helix Technology Corporation, Waltham, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F25B / ;
U.S. Cl.
CPC ...
62-6 ; 60520 ; 92 86 ; 277 53 ;
Abstract
In a cryogenic refrigerator, a displacer 12 and its drive piston 28 are guided by a displacer guide 32 seated within an expander body 16. An expander cap 40 enclosing a spring volume 38 extends within the expander body 16 and abuts the displacer guide 32. An indium seal 50 is positioned in the chamfer at the intersection of the cap, body and guide.