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. 22, 1995
Filed:
Jul. 22, 1993
Applicant:
Inventor:
James P Gillin, Marlton, NJ (US);
Assignee:
Repco Inc., Cherry Hill, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F25D / ;
U.S. Cl.
CPC ...
62 62 ; 622592 ; 29622 ; 29825 ; 29877 ; 200268 ;
Abstract
The useful life of electrical contacts is extended by a cryogenic treatment. An electrical contact is exposed to a low temperature, such as below 172 K for a selected period of time. The low temperature may be obtained via a controlled rate of cooling. After the contact has been exposed to the low temperature, the contact may be returned to ambient temperature at a controlled rate. The cryogenic treatment results in extended useful life of contacts made of materials such as copper and of composite contacts incorporating silver, refractory metals, and metal oxides such as cadmium oxide and tin oxide.