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:
Sep. 05, 2000
Filed:
Nov. 24, 1997
Applicant:
Inventors:
Assignee:
Denso Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
310233 ; 310236 ; 310237 ; 310235 ;
Abstract
In a motor for driving a fuel pump, each contact part of a commutator which slidingly contacts brushes is made of a carbon material. The carbon material is a mixture of natural carbon and amorphous carbon so that the contact part has a longer durability. The weight percentage of the amorphous carbon to be mixed is in the range of 5-30, most preferably about 20. The brush may also be made of a mixture of natural carbon and amorphous carbon.