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| Number | Title | Issue Date |
| 4504700 | Input device A new and efficient input device of an electrode contact type which has a high mechanical strength and durability and can assure accurate detection of coordinates. The input device comprises an elastic flexible insulator spacer having a conductive element... | 03/12/1985 |
| 4503416 | Graphite fiber tactile sensor A layer of carbon fiber materials sandwiched between two conductive layers provides a tactile feedback sensor which is particularly useful in manipulator systems for robotics and assembly automation.... | 03/05/1985 |
| 4493104 | Character recognition device This invention is concerned with a character recognition device which includes a writing pad having a pair of sheets with one of the sheets comprising an area of high resistivity and the other one of the sheets comprising a layer of conductive material, t... | 01/08/1985 |
| 4492819 | Graphic tablet and method A writing tablet is disclosed incorporating a plurality of conductors imbedded beneath the surface thereof in orthogonal relationship with respect to each other. The conductors form a grid for receiving radiated electric signals generated remote from the ... | 01/08/1985 |
| 4484026 | Touch tablet data device A touch tablet for use in entering data into a computer or graphics display device comprises a first four-sided sheet containing a resistive material on one surface thereof, a second four-sided sheet containing a resistive material on one surface thereof ... | 11/20/1984 |
| 4475008 | Coordinate input device with pressure-sensitive rubber sheet In a coordinate input device which comprises a resistance plate and a pressure-sensitive rubber sheet placed on the resistance plate so that DC voltage is alternately applied to the resistance plates in the X-axis direction and Y-axis direction of the res... | 10/02/1984 |
| 4471270 | Particle-impact localizing device, a cathode-ray oscilloscope and a pick-up tube comprising such a device This device comprises several charge-transfer shift registers integrated on the same semiconductor substrate and disposed one above the other along the axis Oy. The charge-transfer electrodes are common to all the registers and each package of charges inj... | 09/11/1984 |
| 4456787 | Electrographic system and method An electrographic system utilizing a singular resistive layer which may be transparent in conjunction with a supportive substrate. Through the use of an electromagnetic field generating sytlus in conjunction with coordinate alternating border switching, l... | 06/26/1984 |
| 4444998 | Touch controlled membrane for multi axis voltage selection A touch controlled membrane device producing an output signal which is a function of any dual coordinate location resulting from an applied pressure in a two dimensional resistive field. In one preferred embodiment a single resistive film is spaced from a... | 04/24/1984 |
| 4442317 | Coordinate sensing device A coordinate sensing device uses electric currents to energize a conducting member which has a major surface and preferably is made of mesh material. Electrical currents are sequentially applied to create alternate noncoincident electrical fields so that ... | 04/10/1984 |
| 4435616 | Graphical data entry apparatus Improvements in graphic tablets employing resistance planes are disclosed including one or more of the following: a tablet usable both by depression and by capacitive probe, reference connections to side midpoints, automatic gain control for capacitive re... | 03/06/1984 |
| 4419672 | Point locator and graphics digitizer system A system for accurately locating upon a surface any number of finite points, recording those locations together with such additional information as is desired to be applied to the surface, and then transferring such recorded information to that surface in... | 12/06/1983 |
| 4371746 | Edge terminations for impedance planes Edge terminations for polygonal impedance or resistance surfaces provide linearization of current flow to and/or from the surface through electrical connections at the vertices of the polygon. The edge terminations are constituted by a series of parallel ... | 02/01/1983 |
| 4319078 | Apparatus for detecting X and Y coordinates of input points The input surface of the apparatus for detecting X and Y coordinates of the input points comprises a first parallel electrode group, a second flexible parallel electrode group opposing and intersecting the first parallel electrode group. A pressure conduc... | 03/09/1982 |
| 4306110 | Apparatus for determining planar coordinates A pair of overlapping, normally spaced conductive sheets (16,18) have sufficient flexibility between them to permit electrical contact when touched. One sheet has spaced, approximately parallel electrodes (20,21). The other sheet has spaced approximately ... | 12/15/1981 |
| 4296406 | Pressure sensitive switch structure The present invention switch comprises a pair of electrodes separated by resilient resistive material which changes resistance several orders of magnitude in response to light pressure. Sensing and amplifying means are provided to detect a predetermined c... | 10/20/1981 |
| 4293734 | Touch panel system and method A general method is disclosed for accurately determining the location or position of a source or sink of electric current on the surface of a resistance element or impedance layer. Touch panels are described that detect the presence of a user's finger on ... | 10/06/1981 |
| 4242676 | Interactive device for data input into an instrument of small dimensions The device according to the invention comprises a sensor formed by a plurality of capacitive or resistive electrodes. The user searches the symbol to be selected by displacing his finger on the sensor while looking at a control display unit. Any position ... | 12/30/1980 |
| 4220815 | Nonplanar transparent electrographic sensor An electrographic sensor for the generation of coordinate signals corresponding to contacted positions on the sensor is described. This sensor is of particular value for placing in intimate contact with the nonplanar face of a cathode ray tube or the like... | 09/02/1980 |
| 4214122 | Resistive planar graphical entry device In a resistive planar graphic device, conductor strips are divided into two segments and corner resistances interconnect outer ends of the conductor strips which extend in spaced relationship along the edges of a rectangular resistive area and which are c... | 07/22/1980 |
| 4198539 | System for producing electric field with predetermined characteristics and edge terminations for resistance planes therefor A system is described for coupling two voltage sources to a resistive plane, surface or layer so as to produce a uniform electric field in said plane with orthogonal components along the two axes of the plane generated by the two voltage sources so that c... | 04/15/1980 |
| 4178481 | Electrical data entry devices Planar resistive connecting means for the edges of a rectangular resistive graphic area has a higher effective resistance parallel to the edges of the resistive graphic area than that of the resistive graphic area. This higher effective resistance is form... | 12/11/1979 |
| 4129746 | Electrographic apparatus and hand rest for use therewith Electrographic apparatus, that is apparatus for obtaining electrical signals related to the movement of a point, such as a pen or stylus, over a pressure sensitive surface. The apparatus comprises a hand-supporting plate movable relative to the pressure s... | 12/12/1978 |
| 4129747 | Human-machine interface apparatus A human-machine interface apparatus includes a first, or phase, surface with associated circuitry so devised that an alternating electrical field is created above the surface with its phase, relative to a fixed point on the surface, changing continuously ... | 12/12/1978 |
| 4126760 | Position indicators A graphical input tablet is described which is made up of layers of flexible material. The edges of planar conductors on the surfaces of the layers divide the layers into zones, with each layer having a unique combination of zones. When a point is indicat... | 11/21/1978 |
| 4080514 | Graphical input apparatus for electrical equipment Two improvements are disclosed for a known graphical input tablet employing a resistive sheet stretched across, but spaced from, a resistive member, wherein the co-ordinates of a point are indicated by pressing the sheet into contact with the member at th... | 03/21/1978 |
| 4079194 | Graphical data entry pad A data entry pad for the entry of two-dimensional graphical data to a communication system includes a resistive grid area to which a conductive layer may be selectively contacted so that graphical data can be generated by external resistance measuring ele... | 03/14/1978 |
| 4071691 | Human-machine interface apparatus A human-machine interface apparatus includes a first, or phase, surface with associated circuitry so devised that an alternating electrical field is created above the surface with its phase, relative to a fixed point on the surface, changing continuously ... | 01/31/1978 |
| 4070544 | Electrographic apparatus and method of producing an electrode surface therefor Electrographic apparatus, that is apparatus for obtaining electrical signals related to the movement of a point, such as a pen or stylus, over a pressure sensitive surface, and a method of producing an electrode surface for such apparatus. The pressure se... | 01/24/1978 |
| 4055726 | Electrical position resolving by zero-crossing delay Position responsive apparatus is disclosed comprising a sheet of uniform resistivity having four electrodes in contact therewith around a rectangular area. One pair of parallel electrodes are respectively energized with time-delayed voltage waveforms havi... | 10/25/1977 |
| 4013835 | Data entry system A novel data entry system is disclosed which comprises both a touch sensitive device and a location identification device. The touch sensitive device includes a printed circuit board arrangement of conductors which define data input locations that are tou... | 03/22/1977 |
| 4001677 | Device for the electrical determination of two-dimensional co-ordinates of a point A device for the electrical determination of two-dimensional coordinates of a point employs a plate and a scanning device. The plate is in the form of a resistance layer comprising material having a given electrical resistance which carries contact strips... | 01/04/1977 |
| 3959585 | Graphical input terminal A graphical input terminal includes a pair of resistive sheets separated by an air gap. An energizing voltage is alternately applied to each sheet while an output voltage representative of the position of contact between the sheets caused by the pressure ... | 05/25/1976 |
| 3944740 | Coordinate position information output device A coordinate position information output device is disclosed in which the impedance at a position addressed by a contact pen, a light pen, a magnetic pen or the like is varied; a forward current is caused to flow by the impedance change in a charge storag... | 03/16/1976 |
