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:
Feb. 26, 2002
Filed:
Jul. 24, 1998
Stephen R. Lewis, Minonk, IL (US);
Charles B. Looney, Gridley, IL (US);
Wade J. Robel, Normal, IL (US);
Larry R. Mitzelfelt, Jr., Morton, IL (US);
David E. Martin, Normal, IL (US);
James D. Griffith, Chenoa, IL (US);
J. Duwayne Manahan, Bloomington, IL (US);
Avtar S. Sandhu, Bloomington, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A spool slides in a bore to open and close a valve. The spool moves in a first direction until the spool forcibly engages a seat in the bore, closing the valve. The spool moves in a second direction opposite the first direction so that the spool disengages with the seat, opening the valve. Proper configuration of the spool and bore geometries in the vicinity of the seat keeps static pressure from developing that could otherwise retard spool valve opening.