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Class Information
Number: 307/400
Name: Electrical transmission or interconnection systems > Electrets
Description: Subject matter wherein an element exhibits a permanent external electrostatic field due to internal polarization.










Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8571835 Vibration powered impact recorder (VPIR) Oct. 29, 2013
8288917 Silicon oxide electret electrode with laminate insulating film surrounding short conductive film Oct. 16, 2012
8277927 Electret and electrostatic induction conversion device Oct. 2, 2012
8212433 Electret and electrostatic induction conversion device Jul. 3, 2012
8129869 Electret and electrostatic induction conversion device Mar. 6, 2012
7956497 Electret device and electrostatic induction conversion apparatus comprising the same Jun. 7, 2011
7947767 Electret materials May. 24, 2011
7879446 Fluorinated cyclic olefin electret film Feb. 1, 2011
7825547 Electret device and electrostatic operating apparatus Nov. 2, 2010
7804205 Electret device and electrostatic operating apparatus Sep. 28, 2010
7589439 Electromechanical transducer element, method for forming an electromechanical transducer element and transducer formed by said method Sep. 15, 2009
7553440 Method and apparatus for electric treatment of substrates Jun. 30, 2009
7525205 Electric power generator Apr. 28, 2009
7498699 Electret and composite formed therewith Mar. 3, 2009
7309558 Use of salt-like structured silicas as charge control agents Dec. 18, 2007
7244292 Electret article having heteroatoms and low fluorosaturation ratio Jul. 17, 2007
7244291 Electret article having high fluorosaturation ratio Jul. 17, 2007
7113321 Optical deflection apparatus and manufacturing method thereof, optical deflection array, imaging apparatus, and image projection display apparatus Sep. 26, 2006
7015254 Description of an inorganic polymer "electret "in a colloidal state along with the method of generating and applications Mar. 21, 2006
6893990 Stable electret polymeric articles May. 17, 2005
6870939 SMT-type structure of the silicon-based electret condenser microphone Mar. 22, 2005
6852402 Dielectric cellular electret film and procedure for its manufacture Feb. 8, 2005
6841917 Electrostatic levitation and attraction systems and methods Jan. 11, 2005
6818092 Multi-layer electret having ultra-high charge stability and method of manufacturing thereof Nov. 16, 2004
6806593 Thin film electret microphone Oct. 19, 2004
6759769 Electromechanic film and acoustic element Jul. 6, 2004
6743464 Method of making electrets through vapor condensation Jun. 1, 2004
6694032 Electret condenser microphone Feb. 17, 2004
6658938 Electret transducer Dec. 9, 2003
6573205 Stable electret polymeric articles Jun. 3, 2003
6489033 Electrets Dec. 3, 2002
6472776 Helmet mount for night vision device Oct. 29, 2002
6409806 Fluorinated electret Jun. 25, 2002
6406657 Method and apparatus for making a fibrous electret web using a wetting liquid and an aqueous polar liquid Jun. 18, 2002
6243474 Thin film electret microphone Jun. 5, 2001
6143455 Use of aluminum azo complex dyes as charge control agents Nov. 7, 2000
5917437 Keyboard Jun. 29, 1999
5757090 Folded dielectric film element and method for maufacturing the same May. 26, 1998
5726107 Non-wovens of electret fiber mixtures having an improved charge stability Mar. 10, 1998
5610455 Electret containing syndiotactic vinyl aromatic polymer Mar. 11, 1997
5590014 Method and apparatus for supplying electric power Dec. 31, 1996
5565717 Devices for manufacturing electrets, and electrets obtained thereby Oct. 15, 1996
5558809 Polymer electrets with improved charge stability Sep. 24, 1996
5544001 Electrostatic relay Aug. 6, 1996
5543224 High molecular electret film Aug. 6, 1996
5536982 Ultra thin polymer film electret Jul. 16, 1996
5436033 Method of manufacturing a polymer ultra thin film electret Jul. 25, 1995
5429848 Electret tubular nonwoven fabric comprising circumferentially oriented parallel reinforcing fibers within a tubular nonwoven fabric Jul. 4, 1995
5411576 Oily mist resistant electret filter media and method for filtering May. 2, 1995
5408187 Electrical fault indicator utilizing a liquid crystal polymer gel dispersion exhibiting two stable contrasting optical states at zero field Apr. 18, 1995

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