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:
May. 23, 1989
Filed:
Sep. 26, 1988
Applicant:
Inventor:
Guy A Wojtanek, Franklin Park, IL (US);
Assignee:
Eaton Corporation, Cleveland, OH (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01C / ;
U.S. Cl.
CPC ...
338114 ; 338 99 ;
Abstract
An apparatus for varying impedance includes a first conductive member, a second member associated therewith, and a third wiper member electrically contacting the first and second members. Use of a conductive rolling member as the third wiper member minimizes wear and degradation of all members. Alternately, or in conjunction with a rolling wiper member, use of a conductive elastomer further eliminates wear.