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:
Apr. 03, 1990
Filed:
Sep. 14, 1987
Applicant:
Inventors:
Stephen F Malaker, Mountainside, NJ (US);
Chester B Pawelski, South Somerville, NJ (US);
Assignee:
Cryodynamics, Inc., Mountainside, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F25B / ;
U.S. Cl.
CPC ...
62-6 ; 621961 ;
Abstract
A modified Stirling cycle cryogenic refrigerator having an improved unloader valve mechanism for bypassing the compressor cylinder for a short time during start-up in order to reduce the starting torque on the motor driving the pistons and when the drive motor is turned off in order to prevent the refrigerator from spontaneously running in reverse.