Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 8129869 | Electret and electrostatic induction conversion device To provide an electret having high stability with time and thermal stability of retained electric charge and having excellent charge retention performance, and an electrostatic induction conversion device comprising such an electret. This has been done by providing ... | 03/06/2012 |
| 7956497 | 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. ... | 06/07/2011 |
| 7825547 | 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. ... | 11/02/2010 |
| 7804205 | Electret device and electrostatic operating apparatus An electret device includes an electret film capable of storing charges and a charge outflow inhibition film formed on an upper surface of a region having a high charge density in the electret film and inhibiting the charges stored in the electret film from flowing ... | 09/28/2010 |
| 7589439 | Electromechanical transducer element, method for forming an electromechanical transducer element and transducer formed by said method Electromechanical transducer element for converting mechanical force, such as vibrations, into electrical signals and a method for fabricating the same, the transducer having a layered structure and comprising: signal and ground layers (103-105, 107) a... | 09/15/2009 |
| 7498699 | Electret and composite formed therewith An electret and composite formed therewith. The electret includes a polymer, copolymerizing from monomers including VdF as a first monomer and HFP, CTFE, TFE, or combinations thereof as a second monomer. ... | 03/03/2009 |
| 7352876 | Method and apparatus for substantially improving power supply rejection performance in a miniature microphone assembly A hybrid circuit (300) for use in a miniature microphone assembly (100) reduces power supply noise on the audio signal input (214) of an impedance buffer amplifier (200) using one or both of shielding conductors 422, 424 to reduce ... | 04/01/2008 |
| 7309558 | Use of salt-like structured silicas as charge control agents The present invention relates to the use of salt-like structured silicates, in which the cation is NH4+, H3O+, an alkali metal, alkaline earth metal, earth metal or transition metal ion or a low molecular weight organic ca... | 12/18/2007 |
| 7289638 | Electroacoustic microphone An electroacoustic capsule or electroacoustic transducer for an electroacoustic device has electrostrictive or magnetostrictive elements connected to a controllable power supply. Dimensional changes of the electrostrictive or magnetostrictive elements cause changes ... | 10/30/2007 |
| 7286680 | Cylindrical microphone having an electret assembly in the end cover A microphone includes a separate end cover with a sound port. A diaphragm is directly attached to the end cover. The backplate is positioned within the housing against a ridge near an end of the housing. A spacer is positioned against the backplate. The diaphragm en... | 10/23/2007 |
| 7276911 | Detection of malfunctioning bulbs in decorative light strings A system for locating a malfunctioning bulb in a decorative light string uses an antenna that produces an output signal corresponding to the strength of the electric field produced by a portion of the light string near the antenna. An amplifier is coupled to the ant... | 10/02/2007 |
| 7260230 | High performance microphone and manufacturing method thereof A microphone (100) and method of manufacture thereof is disclosed. The microphone (100) includes a housing (108), a diaphragm assembly (120), a spacer (134), a backplate assembly (140), a body assembly (150), and a pr... | 08/21/2007 |
| 7244291 | Electret article having high fluorosaturation ratio An electret article that includes a polymeric material that has electric charge imparted thereto, that has a CF3:CF2 ratio of at least 0.15 and that has a fluorosaturation ratio greater than about 200. The electret article may be in the form of... | 07/17/2007 |
| 7244292 | Electret article having heteroatoms and low fluorosaturation ratio An electret article that includes a polymeric material that has electric charge imparted thereto, that has one or more heteroatoms, that has a fluorosaturation ratio of less than 200, and that has an atomic percent fluorine of greater than about 40%. The inventive e... | 07/17/2007 |
| 7239038 | Apparatus for electrical signal generation based upon movement and associated methods A generator/sensor may include a pair of arcuate swing arms having respective opposing ends pivotally carried by a base so that the arcuate swing arms are transverse to one another and define a movable crossing point therebetween. A body may be carried by the arcuat... | 07/03/2007 |
| 7239714 | Microphone having a flexible printed circuit board for mounting components In a microphone cartridge, a flexible printed circuit board serves two functions, separating the diaphragm and backplate, and electrically connecting the cartridge and the buffer amplifier. The flex-print includes a spacer portion that maintains the appropriate dist... | 07/03/2007 |
| 7216417 | Method for manufacturing an electromechanical sensor element Method for manufacturing an electromechanical sensor element for converting mechanical forces produced by the movements and vital functions or a person into electric signals, in which method a sensor film (11) is provided with metallic electrodes (15,16 | 05/15/2007 |
| 7211923 | Rotational motion based, electrostatic power source and methods thereof A power system includes a member with two or more sections and at least one pair of electrodes. Each of the two or more sections has a stored static charge. Each of the pair of electrodes is spaced from and on substantially opposing sides of the member from the othe... | 05/01/2007 |
| 7171012 | Microphone Affixed in intimate contact to the inside surface of a front board 10a of a conductive capsule 10 provided with a receiving sound aperture 10aa is a conductive back electrode board provided with air vent apertures 11a, | 01/30/2007 |
| 7154275 | Method and apparatus for detecting individuals using electrical field sensors A robust, easily deployable, covert, passive intrusion detection system uses one or more E-field sensors to detect the presence of a moving individual and to provide an indication of the presence of the individual adjacent the sensor based on E-field distortion prod... | 12/26/2006 |
| 7136496 | Electret assembly for a microphone having a backplate with improved charge stability The present invention relates to a microphone that includes a housing and a diaphragm and backplate located with the housing. The housing has a sound port for receiving the sound. The diaphragm undergoes movement relative to the backplate, which it opposes, in respo... | 11/14/2006 |
| 7130434 | Microphone PCB with integrated filter The present invention provides a solution to the needs described above through a microphone PCB with an integrated filter. The invention provides for an electret microphone assembly. The microphone assembly includes a multilayer printed circuit board. A field effect... | 10/31/2006 |
| 7113321 | Optical deflection apparatus and manufacturing method thereof, optical deflection array, imaging apparatus, and image projection display apparatus A miniaturized and highly integrated optical deflection apparatus is realized in which the number of electrodes for driving the optical deflection apparatus is reduced. The optical deflection apparatus implements a sheet member that is electrically floating and plur... | 09/26/2006 |
| 7107665 | Method for manufacturing microphone assembly A microphone assembly comprises a microphone, a connector secured to the underside of the microphone. A gasket has a sound collecting hole and is secured on the upper surface of the microphone. ... | 09/19/2006 |
| 7080442 | Manufacturing method of acoustic sensor The present invention relates to a semiconductor electret condenser microphone capable of being reduced in size and including an acoustic sensor 100 and a case 200 for accommodating the acoustic sensor 100, the acoustic sensor 100 has a s... | 07/25/2006 |
| 7072482 | Microphone with improved sound inlet port A microphone comprises a housing defining an inner volume and including a first exterior surface with an aperture leading to the inner volume. The microphone includes a transducing assembly within the housing for converting sound into an electrical signal. A sound i... | 07/04/2006 |
| 7065224 | Microphone for a hearing aid or listening device with improved internal damping and foreign material protection A microphone and method for dampening the frequency response of the microphone by disposing a dampening frame in a rear volume of the microphone. The microphone generally includes a housing, a diaphragm, a damping frame, and a backplate. The diaphragm rests on embos... | 06/20/2006 |
| 7062055 | Elastomeric dielectric polymer film sonic actuator A sonic actuator including a multi-layer membrane having a non-metallic elastomeric dielectric polymer layer with a first surface and a second surface, a first compliant electrode layer contacting the first surface of the polymer layer, and a second compliant electr... | 06/13/2006 |
| 7062058 | Cylindrical microphone having an electret assembly in the end cover A microphone includes a separate end cover with a sound port. A diaphragm is directly attached to the end cover. The backplate is positioned within the housing against a ridge near an end of the housing. A spacer is positioned against the backplate. The diaphragm en... | 06/13/2006 |
| 7043035 | Miniature microphone A microphone for converting sound into an electrical signal includes a generally cylindrical housing including an inlet for receiving sound, an inner backplate, and an outer backplate. The inner and outer backplates are generally cylindrical and substantially concen... | 05/09/2006 |
| 7015254 | Description of an inorganic polymer “electret ”in a colloidal state along with the method of generating and applications The present invention includes an apparatus for generating an inorganic polymer electret in a colloidal state, the inorganic electret in a colloidal state itself, and applications for the inorganic electret in a colloidal state. The invention includes a method for g... | 03/21/2006 |
| 7015624 | Non-uniform thickness electroactive device An electroactive device comprises at least two layers of material, wherein at least one layer is an electroactive material and wherein at least one layer is of non-uniform thickness. The device can be produced in various sizes, ranging from large structural actuator... | 03/21/2006 |
| 7009310 | Autonomous power source 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... | 03/07/2006 |
| 7006077 | Electronic device having touch sensitive slide A communications device such as a mobile phone has a main body communications circuit and a movable housing element such as a touch sensitive slide or a flip-type hinged structure. In one embodiment, the main body communications circuit responds to a touch sensitive... | 02/28/2006 |
| 7002728 | Electrophoretic particles, and processes for the production thereof Copper chromite particles can advantageously be used as black particles in electrophoretic media and displays. Preferably, the copper chromite particles are coated with a silica coating and a polymer coating. ... | 02/21/2006 |
| 6996891 | Method for the manufacture of a sensor element The invention relates to a method for the manufacture of a sensor element and to a sensor element. In the method, both surfaces of a sensor film are provided with metallic electrodes. The sensor element is produced by cutting it from a larger amount of sensor elemen... | 02/14/2006 |
| 6977695 | Variable optical attenuator based on electrically switchable cholesteric liquid crystal reflective polarizers Variable optical attenuators (VOAs) are provided, based on electrically switchable CLC reflective polarizers. The reflectivity of the described reflective VOAs can theoretically be electrically adjusted between 0% to 100%, and the reflective bandwidth can be easily ... | 12/20/2005 |
| 6947568 | Condenser microphone A back plate having a stationary back electrode is secured to a substrate. A diaphragm electrode is mounted on the back plate interposing a spacer. A frame having a sound collecting hole is mounted on the diaphragm electrode. ... | 09/20/2005 |
| 6937735 | Microphone for a listening device having a reduced humidity coefficient A microphone is constructed to be more tolerant to a wide range of relative humidity conditions without adversely affecting the performance of the microphone. The microphone includes a housing with a sound port for receiving sound and an electret assembly for conver... | 08/30/2005 |
| 6928178 | Condenser microphone and method for making the same A condenser microphone includes a housing having a bottom wall that is formed with a recess which is defined by a recess-defining wall. A condenser is disposed in the housing, defines a variable gap chamber, and covers the recess. The condenser includes a back plate... | 08/09/2005 |
