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. 20, 1991
Filed:
Apr. 30, 1990
Applicant:
Inventors:
Charles G Purnell, West Midlands, GB;
Andrew R Baker, Lighthorn, GB;
Assignee:
Brico Engineering Company Limited, West Midlands, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C21D / ; C22C / ; F01L / ;
U.S. Cl.
CPC ...
148 132 ; 2988841 ; 1231 / ; 148 166 ; 148332 ;
Abstract
A valve guide and a method for the manufacture thereof are described. The valve guide is a tubular article having a length to outer diameter ratio greater than about 1.5 and is made of a ferrous material by a PM route. The pressed guide is infiltrated by preparing a sheet of the infiltrant alloy, rolling the sheet into a cylinder and inserting it into the guide bore followed preferably by, simultaneous sintering and infiltration.