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:
Dec. 18, 2012
Filed:
Oct. 07, 2009
Applicants:
Qi MA, Farmington Hills, MI (US);
Brian M. Tulkki, Howell, MI (US);
Inventors:
Qi Ma, Farmington Hills, MI (US);
Brian M. Tulkki, Howell, MI (US);
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01P 3/48 (2006.01);
U.S. Cl.
CPC ...
Abstract
A system includes a transceiver module and a rotating device. The transceiver module generates an electromagnetic (EM) field using an antenna. The rotating device includes N transponders arranged such that each of the N transponders passes through the EM field during one revolution of the rotating device. Each of the N transponders damps the EM field when passing through the EM field. The transceiver module determines a rotational speed of the rotating device based on a number of times the EM field is damped during a period. N is an integer greater than or equal to 1.