Quotables
"Inventing is a combination of brains and materials. The more brains you use, the less material you need."
Charles Kettering
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 4857903 | Electro-optical mouse with improved resolution for compensation of optical distortion An electro-optical mouse has a four-quadrant photodetector, each quadrant producing a voltage proportional to the amount of light impinging thereon. The mouse slides over a surface having optically contrasting, i.e. reflecting and nonreflecting, indicia t... | 08/15/1989 |
| 4831566 | Method and apparatus for calibration of a charge ratio digitizer A conventional three-electrode wedge-and-strip pattern in a digitizer tablet surface is used with a conventional cursor or stylus. A phantom cursor electrode is located at predetermined coordinates of the active area of the digitizer tablet beneath the X,... | 05/16/1989 |
| 4807166 | Method and apparatus for calibrating an electro-optical mouse A method and apparatus for calibrating an electro-optical mouse during the detection of light reflected from a surface with optically contrasting indicia. The voltage output from the light detector is compared with stepped ramped sequences of reference vo... | 02/21/1989 |
| 4794388 | Method of and apparatus for controlling a display Information presented on a visual display is varied in content and size through the use of a single operator-manipulated input device. The foregoing is accomplished through the use of a novel command signal generator which includes a pivotally mounted rot... | 12/27/1988 |
| 4788386 | Menu for a charge ratio digitizer A charge ratio tablet having three patterned electrodes for determining the position coordinates of a stylus relative to a first area on the tablet is provided with a menu in a second area. The menu includes first and second pluralities of menu electrodes... | 11/29/1988 |
| 4786764 | Digitizer stylus with pressure transducer A stylus switch is activated automatically when the tip of the stylus is pressed against a digitizer tablet with sufficient force. The pressure switch includes a transducer in the form of an ink layer having electrical resistance which varies as a functio... | 11/22/1988 |
| 4689448 | Two-dimensional position coordinate determination device with U-shaped delay line An automatic position coordinate determination device has a single U-shaped delay line made of magnetostrictive material. A grid network of electrical conductors including first and second pluralities of parallel conductors arranged substantially perpendi... | 08/25/1987 |
| 4568182 | Optical system for determining the position of a cursor In an optical digitizer, a cursor is movable on a plane surface having coordinate axis. The cursor includes a source of light that is scanned across the coordinate system, and a detector receiving light from the angle to which the beam is instantaneously ... | 02/04/1986 |
| 4546948 | Easel A guide is affixed to the lower surface of a tablet. A rail is reciprocally movable in the guide in a plane parallel to the lower surface of the tablet. A strut is affixed to the rail and extends perpendicular to the plane of the lower surface of the tabl... | 10/15/1985 |
| 4514688 | Digital tablet system with calibration means An improved position determination device utilizes an energized movable pointer which is inductively coupled to a grid of spaced parallel electrical conductors for each coordinate direction. The termini of the spaced conductors of each grid are traversed ... | 04/30/1985 |
| 4482784 | Position determination device A position determining device has two perpendicular longitudinal magnetostrictive elements. A grid of a plurality of closed loop conductors has two parallel straight legs which form the grid. A flux producing element inductively coupled to at least one of... | 11/13/1984 |
| 4368352 | Digitizer with floating scan A digitizer having a pointer or cursor driven by an alternating carrier signal and a grid of sequentially enabled parallel spaced conductors inductively coupled to the cursor in which enabling of the conductors is initiated at an origin conductor and cont... | 01/11/1983 |
| 4368351 | Amplitude modulated digitizer A digitizer having a pointer or cursor driven by an alternating carrier signal and a grid of sequentially enabled parallel spaced conductors inductively coupled to the cursor includes an AM demodulator for detecting the instantaneous time of change of pha... | 01/11/1983 |
| 4243843 | Coarse position digitizer A method and apparatus for determining graphical coordinates includes a grid of parallel spaced conductors, a switch in series with each conductor, a cursor having an alternating magnetic field for inducing an electric current in conductors over which it ... | 01/06/1981 |
| 4081603 | Position coordinate determination device A position coordinate determination device wherein data generation lines are displaced from the edges of a data surface, and a sensing device is movably located on the surface. Erroneous detection of data resulting from reflection of signals at the edge o... | 03/28/1978 |
| 4018989 | Position coordinate determination device A position coordinate determination device employing duodatum digitizations for each coordinate of a pair of respective coordinates and a ratiometric proportionality calculation for calculating a corrected coordinate digitization value in each measured co... | 04/19/1977 |
| 3956588 | Digitizing graphic system using magnetostrictive transducers A digitizing graphic system including a digitizing area, first and second coordinate arms extendable over the area, first and second magnetostrictive elements each positioned respectively in the first and second coordinate arms. A positionable device is m... | 05/11/1976 |
