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:
Nov. 15, 1988
Filed:
Feb. 24, 1987
Applicant:
Inventors:
John W Erickson, Huntington Beach, CA (US);
Samuel D Fegan, King of Prussia, PA (US);
Assignee:
Dresser Industries, Inc., Dallas, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
310 57 ; 310 87 ;
Abstract
A pressure variable sealed container such as a length of rubber tubing is filled with a compressible, thermally conductive fluid such as helium or hydrogen and is placed in a sealed motor stator chamber otherwise filled with a heat conductive liquid, such as oil, before final assembly. As the oil in the stator chamber expands with temperature, the thermally conductive fluid in the container is compressed thereby absorbing the expansion of the oil in the stator chamber.