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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 5438168 | Touch panel A touch panel of the present invention consists of a rectangular resistance member on which a potential gradient formation area is formed, a plurality of thin film active elements constructed in accordance with a side of the potential gradient formation a... | 08/01/1995 |
| 5432304 | Coordinate input apparatus with correction resistance for rectangular, spaced resistance surfaces A coordinate input apparatus for detecting and inputting the coordinates of pressure applied by a pen, includes an input surface and a detection apparatus. The input surface is constructed from first and second input detection members. The first input det... | 07/11/1995 |
| 5424493 | Force resolving system and method Force resolving system and method which are particularly suitable for use in the analysis of handwriting and the verification of signatures. A platen is coupled to a plurality of force transducers in such manner that only forces acting along mutually perp... | 06/13/1995 |
| 5412161 | Handwriting capture system with segmented digitizer A handwriting capture system which includes a handwriting capture device containing a segmented digitizer. The handwriting capture device also includes circuitry which processes handwriting information entered into the segmented digitizer, a controller wh... | 05/02/1995 |
| 5411790 | Signal input sheet A signal input sheet having a cover film made of a soft material at its surface, its repetitive writing durability is improved to obtain a signal input sheet having a good feeling and writing condition, and a high durability. A hard film layer 18 harder t... | 05/02/1995 |
| 5402151 | Data processing system with a touch screen and a digitizing tablet, both integrated in an input device A data processing system includes a multipurpose data input device formed by a touch screen and a digitizing tablet integrated with one another, which are activatable independently of each other by proper stimuli. The touch screen and the digitizing table... | 03/28/1995 |
| 5397865 | Digitizing tablet with display and plot capability, and methods of training a user An interactive training aid system is described which includes a digitizing tablet having a stylus for making inputs to a computer and a display panel for displaying outputs from the computer. Various modes of operation are described wherein the computer ... | 03/14/1995 |
| 5387765 | Data secure digitizer control circuit and method A secure digitizer control circuit and method which drives the digitizer with a random series of excitation signals. The control circuit includes a digitizer and a plurality of drivers for driving the digitizer. A controller varies the excitation signal a... | 02/07/1995 |
| 5380958 | Handwriting capture device A handwriting capture device which employs a highly sensitive digitizer to accurately capture signature information entered using a writing force greater than or equal to a predetermined writing force. The handwriting capture device includes a housing hav... | 01/10/1995 |
| 5369228 | Data input device with a pressure-sensitive input surface A data input device having an arrangement of deformable layers including at least a dielectric material above a resistive layer. The material is elastically deformable so that, when pressure is applied to an input surface, the distance between the input s... | 11/29/1994 |
| 5365598 | Handwritten keyboardless entry computer system A keyboardless entry computer system includes a transparent input screen that generates positional information when contacted by a stylus, and a display screen mounted physically below the input screen such that a character that is displayed can be seen b... | 11/15/1994 |
| 5335230 | Apparatus and method for automatic digitizer fault detection An automatic fault detection apparatus which requires no human intervention. The apparatus includes a source for energizing the digitizer including a constant direct current source and a constant direct voltage source, and a switch for selectively couplin... | 08/02/1994 |
| 5327163 | Display integrated type position reading apparatus A display integrated type position reading apparatus includes a display device driven for display in accordance with a driving signal in synchronization with a predetermined clock signal, and a conductive tablet mounted on a display screen of the display ... | 07/05/1994 |
| 5324895 | Pressure sensitive coordinate input device with improved voltage regulation The invention provides a coordinates input device capable of detecting coordinates with high accuracy by eliminating errors that could be contained in detected voltage depending on the condition of the pressure applied to a coordinates input section. When... | 06/28/1994 |
| 5322978 | Handwriting capture device with integral forms printer A handwriting capture device which includes an integral printer for printing forms and for feeding the forms over a digitizer for signature by a customer. The handwriting capture device employs a highly sensitive digitizer to accurately capture signature ... | 06/21/1994 |
| 5283558 | Low-cost devices for touch control Low-cost devices for touch control by using a matrix of discrete composite switch contacts in close proximity, and x and y terminal measurable parameter such as resistance for touch position sensing and encoding. When a touch position is touched, the corr... | 02/01/1994 |
| 5266750 | Tablet input device It is so constructed that the current flowing during the input waiting period is reduced. A pull-down resistor is connected to one electrode of X-axis electrodes. A diode is connected to one electrode of Y-axis electrodes along the Y-axis electrode direct... | 11/30/1993 |
| 5245139 | Apparatus and method for digitizer sampled point validation An apparatus and method for digitizer sampled point validation which determines the contact resistance at a point of contact between the upper and lower layers of the digitizer and compares the contact resistance with a valid range of contact resistances ... | 09/14/1993 |
| 5227590 | Handwriting capture device A handwriting capture device which employs a highly sensitive digitizer to accurately capture signature information entered using a writing force greater than or equal to a predetermined writing force. The handwriting capture device includes a housing hav... | 07/13/1993 |
| 5225636 | Apparatus and method for digitizer point sampling and validation An apparatus and method for digitizer sampled point validation which compares charge and discharge voltages across a capacitive element within the digitizer or a filter coupled between the digitizer and an analog-to-digital convertor to accept or reject t... | 07/06/1993 |
| 5220136 | Contact touchscreen with an improved insulated spacer arrangement A contact sensor comprises a first sheet of flexible material and second sheet. The first sheet is capable of being energized to establish an electrical potential thereon. The second sheet can be energized to establish an electrical potential in juxtaposi... | 06/15/1993 |
| 5187330 | Positional determination A system for positional determination includes an array of piezoelectric sensor electrodes connected to an array of output lines via resistors for providing a binary code in response to activation of the sensor electrodes; and an array of further output l... | 02/16/1993 |
| 5159159 | Touch sensor and controller A touch sensor is disclosed that senses the two-dimensional position and pressure of an object 34, such as a stylus or finger, that is touching its surface. The sensor is comprised of two insulating substrates 28 and 29 which extend over the area to be se... | 10/27/1992 |
| 5149918 | Touch sensitive overlay An apparatus having a signal conducting line with first and second ends is provided. The signal conducting line is configured to allow changes of impedance at space locations therealong. The signal conducting line is supported by a substrate. A signal gen... | 09/22/1992 |
| 5120906 | Handwriting capture device A handwriting capture device which employs a highly sensitive digitizer to accurately capture signature information entered using a writing force greater than or equal to a predetermined writing force. The handwriting capture device includes a housing hav... | 06/09/1992 |
| 5115330 | Liquid crystal writing slate A slate, such as a writing/drawing slate, includes a base supporting a laminate which has an LC-layer (liquid crystal layer) formed of polymeric material holding micro-volumes of liquid crystal material, a conductive layer on one surface of the LC-layer, ... | 05/19/1992 |
| 5111316 | Liquid crystal writing state A liquid crystal display device includes a base supporting a laminate which has an LC-layer (liquid crystal layer) formed of polymeric material holding micro-volumes of liquid crystal material, and a conductive layer on one surface of the LC-layer, the ot... | 05/05/1992 |
| 5072076 | Tablet digitizer with untethered stylus A Prior Art current digitizer which uses a resistive film and a stylus connected to a current source for locating a stylus by current measurement. A preferred embodiment of a voltage digitizer design which uses a polyvinylidene difluoride (KYNAR) film coa... | 12/10/1991 |
| 5053585 | Multipurpose keyboard using digitizer pad featuring spatial minimization of a pressure contact area and method of making same A multipurpose keyboard incorporating an electronic pressure sensing device, a digitizer pad featuring spatial minimization of a pressure contact area capable of locating the leading and trailing edges of the pressure contact area is described. A processo... | 10/01/1991 |
| 5045644 | Touch sensitive screen with improved corner response A resistor electrode type of gradient sheet for a touch sensor having reduced ripple and bow of equipotential lines along edges and in the corners of the sensor. Orthogonal electrical fields are produced on a resistive surface so as to give coordinates of... | 09/03/1991 |
| 5041701 | Edge linearization device for a contact input system An edge linearization device for linearizing the electric fields in a resistive surface is described. A plurality of electrodes are disposed on the perimeter of an area on a surface having a substantially uniform resistivity. The device utilizes the geome... | 08/20/1991 |
| 5010213 | Signal input sheet A signal input sheet having a flexible upper laminate and a lower laminate. The upper laminate includes either a conductive layer or a resistive layer on its lower surface as a first layer and at least one hand-written input area and at least one binary d... | 04/23/1991 |
| 5008497 | Touch controller A touch controller is presented that comprises a touch sensor employing a resistive membrane, and an analog electronic circuit that accurately measures the touch position and the touch pressure on the sensor. Several variations of the electronic circuit a... | 04/16/1991 |
| 4990725 | Device for locating the unknown position of an electrical conductor belonging to a set of separate conductors and a touch sensitive panel comprising such devices The device locates the position x of the point of connection of one of the electric conductors (2) of unknown ohmic values, connected to unknown separate points of a collecting resistor (R1) of unknown but constant ohmic value per unit length, ... | 02/05/1991 |
| 4989040 | Position input apparatus encluding a position detector input apparatus A position detector outputs an electrical signal of a level corresponding to a pressed position. The detector has at least three reference points, each reference region begin set therebetween. When the position detector is pressed, the region to which the... | 01/29/1991 |
| 4980646 | Impedance tomographic tactile sensor Disclosed is a container holding a partially conductive ionic fluid with a flexible tactile surface covering the fluid and sealing the container. Along the bottom of the container a series of parallel conductors are located with the farthest spaced apart ... | 12/25/1990 |
| 4963702 | Digitizer pad featuring spacial definition of a pressure contact area A digitizer pad apparatus includes at least one digitizer ply where each digitizer ply has a first and a second resistor strip, each with a resistance gradient along its length, oriented in spaced apart relationship. A plurality of conductor traces are in... | 10/16/1990 |
| 4929934 | Pressure-sensitive input apparatus In a pressure-sensitive input apparatus comprising an X-coordinate detection resistive member connected to mutually parallel vertical electrodes and a Y-coordinate detection resistive member connected to mutually parallel horizontal electrodes, for detect... | 05/29/1990 |
| 4897511 | Method of detection of the contacting position in touch panel sensor In a method of detecting a contacting position using a touch panel, a pair of resistance layers formed on two substrates are opposed with a gap. At least one conduction member is provided on one edge of one of the resistance layers and another conduction ... | 01/30/1990 |
| 4873400 | Manually activated position indicator A manually activated position indicator with electrical output signals includes a plurality of adjacent electrodes (S, Al-, Al+, Bl-, Bl+, Ax-, Ax+, Bx-, Bx+,Ay-, Ay+, By-, By+), which are electrically insulated from one another and are covered on one sid... | 10/10/1989 |
