07009310 is referenced by 32 patents and cites 56 patents.

An autonomous power source comprises a power harvester mounted on a movable structure. The power harvester includes a coil, a magnet, and a low-friction ferrofluidic bearing in contact with the magnet, arranged such that the magnet and coil move with respect to each other when the structure is in motion such that an electrical current is produced in the coil. This current is converted to power and stored in an energy storage system and is thus available to power electronic circuitry. The magnet and bearing are preferably enclosed within a closed linear or circular tube, with the coil mounted around the exterior of the tube. The power harvester and battery are combined with one or more sensors and a wireless transmitter to form a tire pressure monitoring system.

Title
Autonomous power source
Application Number
10/756990
Publication Number
7009310 (B2)
Application Date
January 12, 2004
Publication Date
March 7, 2006
Inventor
James A Latty
Westlake Village
CA, US
Jeffrey T Cheung
Thousand Oaks
CA, US
Agent
Koppel Jacobs Patrick & Heybl
Assignee
Rockwell Scientific Licensing
CA, US
IPC
F03B 13/12
H02P 9/04
H02K 7/06
H02K 35/00
H02K 33/00
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