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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:
| Patent Number |
Title Of Patent |
Date Issued |
| 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 |
| 7244291 |
Electret article having high fluorosaturation ratio |
Jul. 17, 2007 |
| 7244292 |
Electret article having heteroatoms and low 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 |
| 5284692 |
Electrostatic evacuated insulating sheet |
Feb. 8, 1994 |
| 5267076 |
Process for obtaining a structure generating non-linear electrooptical effects, structure obtained and applications thereof |
Nov. 30, 1993 |
| 5256176 |
Film electret and an electret filter |
Oct. 26, 1993 |
| 5196784 |
Isolated current monitoring circuit for measuring direct and high duty factor currents |
Mar. 23, 1993 |
| 5061760 |
Vinylidene cyanide alternating copolymers exhibiting nonlinear optical and piezoelectric properties |
Oct. 29, 1991 |
| 5057710 |
Electret materials and the method for preparing the electret materials |
Oct. 15, 1991 |
| 5057588 |
Vinylidene cyanide alternating copolymers |
Oct. 15, 1991 |
| 5019723 |
Self-regulated therapeutic agent delivery system and method |
May. 28, 1991 |
| 4993072 |
Shielded electret transducer and method of making the same |
Feb. 12, 1991 |
| 4910840 |
Electroacoustic transducer of the so-called "electret" type, and a method of making such a transducer |
Mar. 27, 1990 |
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