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:
Jan. 01, 2002
Filed:
Apr. 05, 1999
Abstract
A triboelectric device includes a voltage source, a polarizing amplifier, and electrodes to apply a polarizing voltage to a first material of the device. The electrodes are not fixed to the first material, allowing relative rubbing displacement between the electrodes and the first material. Preferably, a conductive second material, such as petrolatum, is provided between the first material and the electrodes. Such a device can have its properties change while in service. To accommodate this, the voltage source preferably provides an adjustable polarization voltage. The triboelectric device is useful as a transducer, and particularly useful as a hydrophone used in sonar antenna, as its mode type can be changed in the field during service to correct spurious signals or interferring noises.