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:
Dec. 22, 1981
Filed:
Oct. 14, 1980
Applicant:
Inventor:
Myron Schwartz, St. James, NY (US);
Assignee:
Aeroflex Laboratories Incorporated, Plainview, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F25B / ;
U.S. Cl.
CPC ...
62-6 ; 310 / ;
Abstract
A portable cryogenic helium-filled refrigeration system includes a cold finger evaporator, a compressor connected to the cold finger, a brushless DC motor connected to drive the compressor, and an electronic circuit for switching the stator-armature winding currents of the motor. The motor and compressor and the electronic circuit are all enclosed within a common housing which is charged with helium gas refrigerant under pressure.