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. 06, 1988
Filed:
Feb. 24, 1987
Applicant:
Inventors:
Masahito Ishihara, Kani, JP;
Masahito Iwata, Seto, JP;
Assignee:
Tokai TRW & Co., Ltd., Aichi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B21D / ;
U.S. Cl.
CPC ...
2915 / ; 29558 ; 72370 ;
Abstract
A method for manufacturing a single-piece type valve sleeve, includes plastic-working a workpiece thereby to form in the workpiece a blind bore and a plurality of grooves in the surface of the bore and extending lengthwise of the bore, plastic-working a portion of the workpiece at the bottom of the bore so as to form a through hole in the workpiece, and plastic-working an inner portion of the workpiece adjacent the mouth of the bore thereby to close one end of the grooves. A single-piece type valve sleeve is produced by the method.