Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
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| Number | Title | Issue Date |
| 4088915 | Curved polymeric piezoelectric electro-acoustic transducer An electro-acoustic transducer with a piezoelectric diaphragm supported by a support member having a curved portion for imparting a suitable resiliency and/or tension to said diaphragm to improve acoustic characteristics without reducing efficiency of the... | 05/09/1978 |
| 4079437 | Machine and method for poling films of pyroelectric and piezoelectric material An apparatus and method for rapidly and continuously poling a film of polymeric material exhibiting at least one of pyroelectric and piezoelectric characteristics to yield a poled film having a high coefficient of at least one of pyroelectric and piezoele... | 03/14/1978 |
| 4071785 | Laminated piezoelectric matrix switch A matrix switch comprises a lamination of several layers in which first and second piezoelectric films have row and column electrodes, respectively, arranged in parallel on their first surfaces. A ground electrode is between said row and column electrodes... | 01/31/1978 |
| 4064375 | Vacuum stressed polymer film piezoelectric transducer An electro-acoustic transducer has a piezo-electric film polymer diaphragm which is stressed to a part spherical surface and the periphery of which is clamped. Electrodes placed over the surface of the diaphragm apply an electric field transverse the plan... | 12/20/1977 |
| 4056742 | Transducer having piezoelectric film arranged with alternating curvatures A transducer of the type converting between electrical and mechanical energy by means of the piezoelectric effect in a supported sheet of uniaxially oriented, electrically polarized thin high polymer film such as polyvinylidene fluoride, having surface el... | 11/01/1977 |
| 4051397 | Two sensitivity level kinetic sensor A two sensitivity level detector for sensing motion of an object on which the detector is placed. The detector includes a sensing unit that responds to movement of the object by supplying electrical current to sensing circuitry adapted to provide an indic... | 09/27/1977 |
| 4051395 | Weight actuated piezoelectric polymeric transducer A piezoelectric polymer transducer for converting mechanical energy into electrical energy includes a transducing means formed of a polymeric piezoelectric layer of material that is connected at its ends to a support means in such fashion that it can read... | 09/27/1977 |
| 4048526 | Kinetic sensor employing polymeric piezoelectric material A motion detector that includes one or more sensing units fastened by at least one end to an interior portion of a housing. The sensing units are flexible so that they readily bend in response to movement of the detector, and a small weight is mounted on ... | 09/13/1977 |
| 4028566 | Electroacoustic conversion device having a diaphragm comprising at least one of a piezoelectric polymer material A device for converting electric into acoustic vibrations and vice versa, provided with a diaphragm, comprising at least one layer of a piezoelectric polymer material, which is polarized in a transverse direction and which at either side is provided with ... | 06/07/1977 |
| 4024355 | Piezoelectric electro-acoustic transducer with non-uniform backing An electro-acoustic transducer with a piezoelectric diaphragm which is backed with a resilient backing member having a protruded section for imparting a suitable resiliency and/or tension to the diaphragm to highly improve its acoustic characteristics wit... | 05/17/1977 |
| 4008408 | Piezoelectric electro-acoustic transducer An electro-acoustic transducer with a piezoelectric diaphragm supported by a support member having a curved portion for imparting a suitable resiliency and/or tension to said diaphragm to improve acoustic characteristics without reducing efficiency of the... | 02/15/1977 |
| 3978353 | Piezoelectric acoustic speaker system A Piezoelectric speaker system with a piezoelectric diaphragm supported in a cylindrical form and provided with a plurality of vibration regions, which is capable of controlling the directional characteristics by easy operation according to necessity or l... | 08/31/1976 |
| 3976897 | Piezoelectric electro-acoustic diaphragm transducer with composite resilient backing An electro-acoustic transducer with a piezoelectric diaphragm which is backed with a plurality of different resilient members for imparting a suitable resiliency and/or tension to said diaphragm to highly improve its acoustic characteristics with a simple... | 08/24/1976 |
| 3973150 | Rectangular, oriented polymer, piezoelectric diaphragm A piezoelectric electro-acoustic transducer employing as a diaphragm a uniaxially stretched film of a shape having the major axis and the minor axis, wherein the expansion-contraction direction of the diaphragm, in which a piezoelectric constant is at a m... | 08/03/1976 |
| 3971250 | Electret sensing medium having plural sensing units A sensing medium having two sensing units each formed of a layer of poled electret material that is coated on each planar surface with an electrically conductive plate, such sensing units being separated from one another by a thermal insulating layer.... | 07/27/1976 |
| 3969927 | Vibration measuring and the apparatus therefor A method of measuring the mechanical vibration of an object comprising contacting one of the surfaces of a piezoelectric element comprising a polarization treated polyvinylidene fluoride piezoelectric film having metal thin films as electrodes deposited o... | 07/20/1976 |
| 3970862 | Polymeric sensor of vibration and dynamic pressure A transducer, and method for making it, comprising a composite film for sing pressure comprising a pair of film sandwiches, each sandwich comprising a poled polymeric films with metallic film electrodes on opposite surfaces. One electrode does not extend... | 07/20/1976 |
| 3947644 | Piezoelectric-type electroacoustic transducer A piezoelectric-type electroacoustic transducer composed of two convex or concave piezoelectric polymer films each having electrodes on both surfaces thereof, said two polymer films being so connected to electric wiring that, when the one of the piezoelec... | 03/30/1976 |
| 3943614 | Method of polarizing high molecular weight films A method of polarizing high molecular weight films comprising polarizing elongated strips of polar high molecular weight film upon which conductive thin films as opposing electrodes are deposited on both surfaces thereof the strips being assembled in an e... | 03/16/1976 |
| 3940637 | Polymeric piezoelectric key actuated device A key input device which forms a key switch with high reliability or an integrated keyboard with small dimensions which can produce coded signals with high reliability and a S/N ratio of high value without any encoder circuits, comprising a piezoelectric ... | 02/24/1976 |
| 3935485 | Piezoelectric key board switch A key board switch comprising a multi-piezoelectric polymer film element A having, in the surface of the polymer film, a plurality of piezoelectric unit elements satisfying the following criteria: (a) the unit elements have electrodes on both surfaces the... | 01/27/1976 |
