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:
Mar. 30, 2010
Filed:
Jun. 30, 2006
Joseph Edward Tabor, Eureka, IL (US);
Joseph Edward Tabor, Eureka, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A cartridge valve assembly includes a body having a pilot port, a first port, a second port, a third port fluidly connected to a central bore, and a spool positioned within the central bore and being movable between at least a first position and a second position. The spool includes a first chamber at a first end surface of the spool in fluid communication with the pilot port, a second chamber at a second end surface of the spool, and a control chamber. The area of the first end surface is greater than the area of the second end surface. A passage fluidly communicates the control chamber with the second chamber. In the first position, the first port and the second port fluidly communicate with the control chamber. In the second position, the second port and the third port fluidly communicate with the control chamber.