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:
May. 28, 2002
Filed:
Mar. 15, 1999
Applicant:
Inventor:
George Kadlicko, Bolton, CA;
Assignee:
Microhydraulics Inc., Brampton, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01B 3/112 ;
U.S. Cl.
CPC ...
F01B 3/112 ;
Abstract
An actuator has a position encoder provided by a piston rod having a body of magnetic material progressively tapering from one end to another in a direction of relative movement between the piston rod and a cylinder. The piston rod has a coating of non-magnetic material, providing a smooth, uniform exterior surface. An array of Hall effect sensors is mounted in a support located in and radially movable relative to an end cap fixed to the cylinder.