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| Number | Title | Issue Date |
| 7164335 | Switch assembly employing magnetic reed switches A three-position push-pull switch assembly is disclosed that includes two magnetic reed switches mounted to a circuit board located within the switch housing. A magnet is mounted to an actuator that extends into the switch housing and is axially translatable from a ... | 01/16/2007 |
| 6962452 | Keyboard having key floating device A keyboard includes a housing having a number of passages formed by cylindrical members, a number of keys each having a shank slidably engaged in the passages of the housing, and an electromagnetic floating force generating device having a number of coils arranged t... | 11/08/2005 |
| 6685369 | Housing assembly for membrane keyboard A housing assembly in which is placed a membrane keyboard is placed between the pressing layer and the base support. Pressing labels and key zones are respectively printed on a surface of the membrane keyboard and on the pressing layer at corresponding lo... | 02/03/2004 |
| 6491457 | Apparatus and method for deriving electric power efficiently from a keyboard A keyboard apparatus has keys for operation by a user. The keyboard includes a first plurality of keys being coupled to electrical generator apparatus for generating electricity from their operation. A second plurality of the keys is not coupled to electr... | 12/10/2002 |
| 6407679 | System and method for entering text in a virtual environment A system and method for entering text in a virtual environment by sensory gloves. The user enters a key that represents one or more letters by simulating a press of a keyboard in the gloves. The user calibrates the gloves by entering text, during which ti... | 06/18/2002 |
| 5066951 | Circuit arrangement for adjusting the triggering point of an inductive keyboard The present invention is directed to a circuit arrangement for adjustment of the triggering point of the keys in an inductive keyboard. The keyboard consists essentially of a printed circuit board designed in a matrix-like manner, comprising coils superim... | 11/19/1991 |
| 4722621 | Keyboard assembly and recording apparatus A keyboard assembly for selecting characters to be recorded includes a substrate carrying an array of characters arranged on one face thereof. A character selection device moves between advanced and retracted positions along each of two axes of the array ... | 02/02/1988 |
| 4665461 | Circuit for reducing electromagnetic interference from magnetic core keyboards The present disclosure describes circuit variants for reducing electromagnetic interference from saturable core keyboards to acceptable levels. The invention finds particular application in conjunction with capacitive-discharge scan techniques used in suc... | 05/12/1987 |
| 4564832 | Membrane keyboard having key closure retention A membrane panel keyboard is presented having magnetic material in one contact element and magnetic field generating means to achieve self-retention or key closure retention when a key is actuated.... | 01/14/1986 |
| 4529967 | Non contacting inductive keyboard An inductive keyboard, including, printed circuit patterns forming a multiplicity of key excitation patterns and key sensing patterns. The key excitation patterns are divided into groups of excitation patterns formed in rows. The key sensing patterns are ... | 07/16/1985 |
| 4507651 | Contact-free push-button key for generating an electrical signal upon depression thereof A contact-free push-button key for converting mechanical energy into an electrical signal has a toroidal tape core comprised of material having a low magnetic retentivity such as an amorphous metal alloy, the toroidal tape core having an electrical windin... | 03/26/1985 |
| 4494109 | Noncontacting keyboard employing a transformer element Noncontacting transformer switches are interconnected into keyboard networks which include insertable magnetic core, shorted turn or combination actuators. In a preferred embodiment, windings are provided and interconnected to form differential transforme... | 01/15/1985 |
| 4414537 | Digital data entry glove interface device A man-machine interface is disclosed for translating discrete hand positions into electrical signals representing alpha-numeric characters. The interface comprises a glove having sensors positioned with respect to the hand for detecting the flex of finger... | 11/08/1983 |
| 4264225 | Bounce dampening system for switch actuators A bounce dampening system reduces switch actuator bounce when the actuators are restored to their home position. Included are selection interposers, one of which is selectively driven to thereby effect motion of selection bails and corresponding switch ac... | 04/28/1981 |
| 4201489 | Keyboard actuatable with the aid of the fingers of at least one hand A keyboard which has support frame, or several rows of key units. Each key is movable out of an initial inoperative position by the tip of the index finger. The key of each key unit of a guide key row has a key rod and a top face on one end of the key rod... | 05/06/1980 |
| 4016967 | Decoding means with error inhibitor for use with a typewriter Apparatus is disclosed for attachment to a standard typewriter for selectively actuating one or more of a plurality of magnetically actuated switches to provide unique electrical signals that can be recorded or otherwise used to transmit information. The ... | 04/12/1977 |
| 3972403 | Decoding means for use with a typewriter Apparatus for attachment to a standard typewriter for selectively actuating one or more of a plurality of magnetically actuated switches in electrical circuits that are connected to recording means through an electrical matrix circuit. A switch and actuat... | 08/03/1976 |
| 3964062 | Keyboard switch system A keyboard switch system for stenographic machines whereby electrical signals corresponding to key depression may be derived. The switch system is comprised of a plurality of coils each having a coil parameter effecting plunger coaxial therewith and sprin... | 06/15/1976 |
| 3940578 | Keyboard structure having panel mounted key actuators with electrical component operating element An electronic keyboard has a chassis with keys each utilising a parallel motion linkage to permit movement of an operating member towards an electric circuit element. The main structure of the keys and linkage may be formed as a unitary plastics moulding.... | 02/24/1976 |
