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:
Jan. 15, 2013
Filed:
Aug. 06, 2009
Richard J. Lech, Burlington, IA (US);
Garrett Anderson, Burlington, IA (US);
Matthew J. Hennemann, Burlington, IA (US);
C. David Anderson, Burlington, IA (US);
Richard J. Lech, Burlington, IA (US);
Garrett Anderson, Burlington, IA (US);
Matthew J. Hennemann, Burlington, IA (US);
C. David Anderson, Burlington, IA (US);
CNH America LLC, New Holland, PA (US);
Abstract
An open center hydraulic system that includes a variable displacement pump having an inlet, an outlet and a sensing port, the pump configured to provide reduced fluid flow in response to a predetermined fluid pressure differential between the outlet and the sensing port. A first fluid circuit and a second fluid circuit each serve as signal lines with the pump sensing port. During operation of the second fluid circuit, reduced fluid flow from the pump outlet is achieved as a result of the sum of induced fluid pressure reductions of respective controlled pressure reduction devices approaching the predetermined pump fluid pressure differential.