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. 14, 1999
Filed:
Apr. 16, 1998
Applicant:
Inventors:
Thomas J Hajek, Jr, Lockport, IL (US);
Srikrishnan T Tolappa, Aurora, IL (US);
Assignee:
Caterpillar Inc., Peoria, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K / ;
U.S. Cl.
CPC ...
251333 ; 251359 ;
Abstract
A valve interface provides a zero leak function for an area control valve. The valve interface is established by sealing contact between a concave valve face and a convex valve seat having mismatched radii. The concave valve face is formed on a valve element slidably disposed in a bore of a housing and the convex valve seat is formed in the housing and intersects with the bore.