Class / Patent application number | Description | Number of patent applications / Date published |
307400000 | ELECTRETS | 13 |
20080258565 | ELECTRET DEVICE AND ELECTROSTATIC INDUCTION CONVERSION APPARATUS COMPRISING THE SAME - An electret device includes an electret film into which charges are injected and a barrier film provided on a surface of the electret film and having an electron affinity smaller than the electron affinity of the electret film. | 10-23-2008 |
20080265686 | ELECTRET DEVICE AND ELECTROSTATIC OPERATING APPARATUS - An electret device includes an electret film capable of storing charges and a protective film formed so as to substantially surround a side end surface of the electret film. | 10-30-2008 |
20110012438 | ELECTRET AND ELECTROSTATIC INDUCTION CONVERSION DEVICE - To provide an electret having a high surface charge density, and an electrostatic induction conversion device comprising such an electret. | 01-20-2011 |
20110095626 | Hybrid Electret - This invention discloses a hybrid electret. The hybrid electret comprises at least a first dielectric layer and at least a second dielectric layer, and the first dielectric layer and the second layer are alternatively stacked. The first dielectric layer comprises at least a polymer and the second dielectric layer comprises at least a polymer, and the polymer of the first dielectric layer differs from the polymer of the second dielectric layer. | 04-28-2011 |
20110163615 | Patterned Electret Structures and Methods for Manufacturing Patterned Electret Structures - A patterned electret structure ( | 07-07-2011 |
20110254384 | Method and apparatus for electric - Methods and apparatus for hydrodischarging and hydrocharging substrates and articles to produce enhanced ability to avoid attraction of contaminants or improved capability of removing contaminants from fluids are disclosed. In another form the method involves removal of electric charges or neutralization of charge on or within substrates. Also disclosed are methods of making using electret substrates and articles for removing particulates and mists from fluid streams. | 10-20-2011 |
20120228964 | ELECTRIC POWER GENERATION DEVICE AND ELECTRONIC INSTRUMENT - Disclosed is an electric power generation device comprising: a pair of electrodes arranged opposite to each other; and an electret member that is arranged between the pair of electrodes to be spaced apart from the pair of electrodes, and is provided to be movable in a direction of a perpendicular axis passing through the pair of electrodes. | 09-13-2012 |
20130106201 | METHOD OF TOPOGRAPHICAL AND ELECTRICAL NANOSTRUCTURATION OF A THIN FILM OF ELECTRET POLYMER AND THIN FILM OF ELECTRET POLYMER OBTAINED | 05-02-2013 |
20140203667 | Device for the transmission of an electromagnetic signal - A device for the transmission of electromagnetic signals, the device comprising: a conductive element at least one inducer, for inducing charge in said conductive element; a transmission circuit, for generation and transmission of electromagnetic signals; wherein said conductive element and said at least one inducer are movable, with respect to each other, between a plurality of relative positions; in a first position of said relative positions, said at least one inducer is arranged to induce a charge in said conductive element; in a second position of said relative positions, said conductive element is arranged to discharge; the conductive element is arranged to couple with the transmission circuit, in said first position and/or said second position, such that charging and/or discharging of said conductive element causes the transmission circuit to generate and transmit an electromagnetic signal; and the device is arranged such that movement of said device causes relative movement of said conductive element and said at least one inducer between said plurality of relative positions. | 07-24-2014 |
20150022028 | SYSTEM AND METHOD FOR ELECTRET SURFACE POTENTIAL RESTORATION BY A DIRECTIONAL PULSATING ELECTRIC FIELD - A system is disclosed for restoring a surface field potential of an electret material. An oscillator generates an oscillating output, and a power amplifier amplifies the oscillating output. A step-up transformer generates a high voltage alternating current output from the amplified oscillating output, and a polarity controller generates one of a positive pulsating output and a negative pulsating output from the high voltage alternating current output. | 01-22-2015 |
20160009552 | Micro/nano structures of colloidal nanoparticles attached to an electret substrate and method for producing such micro/nano structures | 01-14-2016 |
20160102223 | POLYMER ELECTRET AND METHOD OF MANUFACTURING THE SAME - Provided is a method of manufacturing a polymer electret. The method of manufacturing a polymer electrets includes forming a polymer thin film, which includes a block copolymer (BCP) having two or more polymer chains covalently bonded together; forming a nano-structure of the BCP in which a first block formed by first polymer chains that self-assemble together and a second block formed by second polymer chains that self-assemble together are micro-phase-separated, by performing an annealing process on the polymer thin film; forming a porous polymer film with a nano-pore by selectively removing one of the first block and the second block; and charging the porous polymer film. | 04-14-2016 |
20160165355 | MICROELECTROMECHANICAL SYSTEMS ELECTRET MICROPHONE - Microelectromechanical systems (MEMS) electret acoustic sensors or microphones, devices, systems, and methods are described. Exemplary embodiments employ electret comprising an inorganic dielectric material such as silicon nitride in MEMS electret acoustic sensors or microphones. Provided implementations include variations in electret acoustic sensor or microphone configuration and recharging of the electret. | 06-09-2016 |