William F. Semple, a dentist, was awarded the first US Patent on chewing gum in 1869. His recipe contained powdered chalk.
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| Number | Title | Issue Date |
| 5406538 | Optical disk system with table of contents In an optical disc 7 and an optical disc recording apparatus wherein a desirable information signal is recorded in a recording area of the optical disc 7 in which data such as musical number, starting time, ending time and so on based on the information s... | 04/11/1995 |
| 5367380 | Velocity modulation apparatus for three-tube projection TV In the velocity modulation apparatus for a three-tube projection television, an effective velocity modulation can be implemented under due consideration of humans eye's relative visibility characteristics with respect to the three primary colors of R, G a... | 11/22/1994 |
| 5367230 | Cathode-ray tube with convergence yoke lens systems A cathode-ray tube has an electron gun disposed in its neck in confronting relationship to a phosphor screen through a deflection yoke mounted on the funnel. The electron gun has a cathode assembly for emitting three electron beams, and a main lens for pa... | 11/22/1994 |
| 5364735 | Multiple layer optical record medium with protective layers and method for producing same An optical recording medium in which a recording layer (4) on which optically readable data are recorded is formed on a rectangular base material (1), a protective layer (5) is formed by roll coating on the recording layer (4) and wherein the base materia... | 11/15/1994 |
| 5361407 | Double superheterodyne receiver with independent frequency calibration of two local oscillators A superheterodyne receiver comprises a variable frequency oscillator of PLL (phase-locked loop) type for implementing a first local oscillator and a variable frequency oscillator not of PLL type for implementing a second local oscillator. At least the fre... | 11/01/1994 |
| 5359421 | Bezel with a pair of opposing elongate ribs and a number of smaller ribs for contacting a cathode ray tube A bezel which minimizes possible production of powder by rubbing thereof with a cathode ray tube to prevent possible deterioration of an appearance of a display unit in which the bezel and the cathode ray tube are assembled. The bezel has, around a substa... | 10/25/1994 |
| 5359265 | Display apparatus having plural scanning frequencies A display apparatus for displaying a video image operates with plural horizontal scanning frequencies. The apparatus includes a horizontal scanning frequency oscillator for generating a signal in synchronism with a horizontal synchronous signal of an inpu... | 10/25/1994 |
| 5359336 | Circularly polarized wave generator and circularly polarized wave receiving antenna A circularly polarized generator for transmitting circularly polarized transmitted electromagnetic waves and a circularly polarized wave reception antenna for receiving the electromagnetic waves is disclosed. A crank-shaped conductor pattern composed of a... | 10/25/1994 |
| 5357577 | Vacuum tube microphone apparatus A microphone apparatus including a vacuum-tube amplifier amplifying an electric signal converted from an acoustic signal includes a thermo-ionic cooling element having two surfaces, in which a first surface is in contact with the vacuum-tube amplifier for... | 10/18/1994 |
| 5357524 | Apparatus for converting a digital signal A maximum likelihood decoder (28) comprises a Viterbi decoding unit (30) and a symbol concluding unit (29). Final N-M bit data of data of N (>M) bit unit, to which M-bit original data is converted, is supplied to the symbol concluding unit (29) as a termi... | 10/18/1994 |
| 5357304 | Image development apparatus and method An image developing apparatus using a laser beam source to produce an original plate for producing a master disk of an optical type recording disk such as video disk and the like. A disk base plate 3 formed thereon with an exposed optically sensitive film... | 10/18/1994 |
| 5357144 | Complementary logic circuit There is disclosed a circuit arrangement to permit reduction of the occupation area and the power consumption in a complementary logic circuit constituting a sequence circuit such that it is used in a manner switched between ON state and OFF state. This c... | 10/18/1994 |
| 5356089 | Reel lock for video cassette A tape cassette includes supply reel and a takeup reel each with a plurality of notches arranged along the entire outer circumference of the lower flange of the reel. A plurality of projections are provided on a lower housing of the cassette for engaging ... | 10/18/1994 |
| 5355997 | Storage case for disc-shaped recording media To facilitate the handling and retrieving a cassette from among a large numbers of such cassettes contained in a case a pair of right and left inner boxes are arranged in the right and left length direction of an outer box. The inner boxes are rotatably m... | 10/18/1994 |
| 5357545 | Synchronizing signal detecting circuit When supplied with an external synchronizing signal from an input terminal (2), a synchronizing separating circuit (6) separates and detects a horizontal synchronizing signal from the input signal and generates an HD pulse. When supplied with the HD pulse... | 10/18/1994 |
| 5355527 | Radio receiver with display memory and keys for displaying selecting, and storing station frequencies A radio receiver of a synthesizer type having a PLL adapted to make frequency conversion of a received signal using an oscillated signal by the PLL to thereby achieve channel selection select keys, a register key, a page key, a display and a microcomputer... | 10/11/1994 |
| 5355432 | Speech recognition system A speech recognition system includes an acoustic analyzer which produces a time sequence of acoustic parameters from an input speech signal in an utterance boundary thereof, and estimates a trajectory in a parameter space from the time sequence of acousti... | 10/11/1994 |
| 5355181 | Apparatus for direct display of an image on the retina of the eye using a scanning laser A direct viewing picture image display apparatus displays a good picture image with a small amount of light and low power consumption using a laser beam without producing speckle noises. The display apparatus comprises a light source for emitting a laser ... | 10/11/1994 |
| 5355163 | Video camera that automatically maintains size and location of an image within a frame A video camera system can track or follow the moving object without influence by other objects outside the desired image. Detection feature patterns are formed after brightness and hue frequency feature data is obtained on the basis of image information o... | 10/11/1994 |
| 5355495 | Control system for a recording and/or reproducing apparatus A method of performing state transition control in an electronic apparatus in which it is first determined whether a functional transition request has occurred. A main routine is performed if no transition request has occurred and a state transition proce... | 10/11/1994 |
| 5353068 | Video signal combining apparatus and method A video signal combining apparatus for combining at least three video signals (VA, VB, VC) including a key signal (KA, KB, KC) and depth signal (ZA, ZB, ZC) incl... | 10/04/1994 |
| 5349444 | Video signal output circuit with adaptive equalizer A video signal output circuit used in a TV set to sample the frequency level of an input video signal so that monitored pictures are automatically optimized in quality. A luminance signal is separated from the input video signal by a Y/C separator. A plur... | 09/20/1994 |
| 5349285 | Power supply circuit In a power supply circuit formed into an IC for use in a battery-powered apparatus, an operating current line of a first circuit and that of a second circuit are connected in series to a power source. An output line of a constant voltage regulator is conn... | 09/20/1994 |
| 5349274 | Bi-directional scan circuit In a dual direction horizontal bi-directional scan circuit, deterioration of the picture quality is prevented, while linearity is improved without supplying wasteful deflecting current, and pin distortion is corrected. The deflecting current in the going ... | 09/20/1994 |
| 5348441 | Parts tray conveying system A parts tray conveying system includes a first station for supplying a plurality of occupied trays each containing parts under a stacked condition; a second station for separating the occupied trays under the stacked condition one by one from the upper st... | 09/20/1994 |
| 5346491 | Feed device for bipolar electrodes for capsulotomy A pulsed high frequency current is fed to a bipolar diathermy instrument for optimum execution of a section in capsulotomy. The pulse duration can constantly be altered between 3 ms and 11 ms, whereby a pause of 30 ms or 22 ms develops. This pause is suff... | 09/13/1994 |
| 5347396 | Photovideo camera A photovideo camera takes visual images formed on negative films and/or positive films to obtain video signals corresponding to the visual images. The camera unit of the photovideo camera can be focused after determining a desired angle of view by zooming... | 09/13/1994 |
| 5347621 | Method and apparatus for processing image data Image data is processed by dividing an entire screen into a predetermined number of unitary blocks of pixels, then storing data of the divided screen blocks from an image data recording medium into memories, and processing the data for displaying the imag... | 09/13/1994 |
| 5347500 | Compact optical pickup head with tracking error signal generator An optical pickup head apparatus comprises a yoke provided in an opposing relation to a magnet, a movable member having formed therethrough an aperture into which the yoke is inserted and around which a first coil is wound in an opposing relation to the m... | 09/13/1994 |
| 5343335 | Signal processing system having intersymbol-interference cancelling means and method of same A reproduction equalizer including a linear equalizer for linearly equalizing a source signal read from a recording medium, a nonlinear cancellation means for cancelling intersymbol-interference (ISI) contained in the reproduction signal, a decoder for de... | 08/30/1994 |
| 5343257 | Screen cover opening/closing device for television receiver A screen cover opening device for a television receiver is provided with a screen cover openably closing left and right side portions or upper and lower side portions of a screen adapted for electively displaying plural different aspect ratio images. Two ... | 08/30/1994 |
| 5343197 | Digital-to-analog converter A pair of equilibrium output signals P(+) and P(-) from a 1-bit D/A converter IC, which is made up of an oversampling filter, noise shaper and a pulse converter, are supplied to a pair of field effect transistors connected in a common drain configuration.... | 08/30/1994 |
| 5343119 | Index type CRT having a photosensor with a function of amplifier A display device includes a beam index type cathode ray tube having a fluorescent screen on which red, green and blue fluorescent materials are formed in strip configurations and further index fluorescent materials are formed in strip configurations with ... | 08/30/1994 |
| 5343111 | Cathode ray tube and degaussing coil employed therein A cathode ray tube having degaussing coils attached to an outer side of a glass vessel of a funnel part of a main body of the cathode ray tube, in which the degaussing coils each include a flattened part, extended along the outer front surface at a front ... | 08/30/1994 |
| 5343100 | Thyristor ignition circuit In a thyristor ignition circuit, a forward voltage drop occurring in a signal path of an anode and a gate of a thyristor is reduced. An anode of a thyristor of the thyristor ignition circuit is connected to one signal terminal, and a gate thereof is conne... | 08/30/1994 |
| 5343334 | Video tape that records, plays back, and rerecords video signals to overcome dropouts In a video tape recorder, recording and reproducing heads record and reproduce a recording signal on recording tracks which are diagonally formed one after another on a tape-like recording medium. The recording heads are capable of recording again the sam... | 08/30/1994 |
| 5341385 | Method and apparatus for decoding Reed-Solomon code A decoding method of Reed-Solomon code produces an error position polynomial ς(x) and an error evaluation polynomial ω(x) by a Euclidean algorithm, whereby a syndrome polynomial S(x) is obtained, the highest degrees of the syndrome polynomial S(x) and o... | 08/23/1994 |
| 5341072 | Bi-directional scan circuit At a horizontal deflecting circuit of bi-directional deflection, timings of deflection of forward scan path and backward scan path are respectively controlled. The timing of deflection of forward path or backward path is controlled at the first timing con... | 08/23/1994 |
| 5340673 | Method of manufacturing a phosphor screen of a cathode ray tube A method of forming a phosphor screen in which a color filter layer is formed between a phosphor layer and an inner surface of a panel having a slurry in which a fine particle pigment and transparent particles are dispersed into a photosensitive liquid co... | 08/23/1994 |
| 5341254 | Tape recording and/or reproducing apparatus Apparatus is provided for switching between recording and playback modes of a tape recorder having a single input/output jack to which an output plug for an earphone, a headphone or the like, or an input plug for a microphone or the like can be connected.... | 08/23/1994 |