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. 24, 1998
Filed:
May. 26, 1995
Raj T Nagarajan, Peoria, IL (US);
Charles R Miller, Metamora, IL (US);
Craig W Lohmann, Denver, IA (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A valve includes a housing having a high pressure inlet, a low pressure inlet, an outlet and first and second sealing surfaces. A pilot valve is disposed in the housing and includes a valve element movable between first and second positions. A movable spool is also disposed in the housing and includes third and fourth sealing surfaces engagable with the first and second sealing surfaces, respectively, carried by the housing to connect the outlet to the low pressure inlet when the valve element is in the first position and to connect the outlet to the high pressure inlet when the valve element is in the second position.