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:
Apr. 20, 2004
Filed:
Dec. 11, 2002
Applicant:
Inventors:
Gregory C. Brown, Chanhassen, MN (US);
James A. Johnson, Savage, MN (US);
Eric R. Lovegren, Big Lake, MN (US);
Assignee:
Rosemount Inc., Eden Prairie, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01B 2/526 ;
U.S. Cl.
CPC ...
F01B 2/526 ;
Abstract
A piston position in a cylinder of a hydraulic assembly is measured using microwave pulses. The microwave pulses are launched along a conductor coupled to the piston or cylinder. A sliding member is slidably coupled to the conductor and moves with the piston or cylinder. Position is determined as a function of a reflection from the end of the conductor and the sliding member. Various aspects include signal processing, fudicial pulse identification control and input/output circuitry, and a three conductor configuration.