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:
Jul. 22, 1997
Filed:
Mar. 24, 1995
Applicant:
Inventors:
Assignee:
Nippondenso Co., Ltd., Kariya, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01F / ;
U.S. Cl.
CPC ...
29607 ; 296021 ; 72 46 ; 83 22 ; 2395855 ;
Abstract
A block of material used for making a movable core for a fuel injector is prepared from a bar or coil of material by clamp shearing using a working fluid containing an extreme-pressure additive (such as sulfur, chlorine or phosphorus). The additive reacts with the material to form a protective layer (of e.g. sulfide, chloride or phosphate) on the cut-off surface of the block. The block is cold forged so that its cut-off surface having the protective layer may form a wall defining a fuel passage. The layer prevents the material from being seized with any die or punch used for cold forging.