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:
Jun. 22, 2004
Filed:
Nov. 04, 2002
Keith Bridger, Washington, DC (US);
Arthur V. Cooke, Baltimore, MD (US);
Frank J. Crowne, Laurel, MD (US);
Joseph J. Lutian, Arnold, MD (US);
John M. Sewell, Cockeysville, MD (US);
George L. Small, III, Williamsville, NY (US);
Other;
Abstract
A compact hybrid actuator has a fluid pump ( ) arranged to supply fluid to an actuator ( ). The pump has at least one electrically-powered solid-state pump driver ( ) provided with a displacement element ( ). The position of this displacement element modulates the volume of a fluid chamber ( ). A driven valve ( ) is operatively arranged to control the flows of fluid with respect to the pump chamber, and has one member ( ) movable relative to a body ( ) to modulate the opening of ports ( ) so as to form at least one three-way valve. A valve driver ( ) is operatively arranged to operate the driven valve. Electrical power is provided to each valve and to the valve driver so as to operate these various elements in synchronism with one another. The improved pump driver and driven valve may be operated at frequencies in excess of 1 kHz.