Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 4922515 | Communication network cut-off detection arrangement Cut-off malfunctions in a communication network are lcoated by establishing a connection through the network between a first terminal and a second terminal. At the first terminal, a prescribed sequence of first signals is generated and applied to the esta... | 05/01/1990 |
| 4866510 | Digital video encoder A differential pulse code arrangement reduces the bit rate of a composite color video signal by sampling the video signal at a predetermined rate of m times the color sub-carrier frequency, predicting the present video signal sample from reconstructed pas... | 09/12/1989 |
| 4164025 | Spelled word input directory information retrieval system with input word error corrective searching An arrangement for retrieving information from a directory responsive to a sequence of spoken character signals in which a set of probable characters for each character signal is stored in a position ordered array. A candidate word is formed from the most... | 08/07/1979 |
| 4133976 | Predictive speech signal coding with reduced noise effects A predictive speech signal processor features an adaptive filter in a feedback network around the quantizer. The adaptive filter essentially combines the quantizing error signal, the formant related prediction parameter signals and the difference signal t... | 01/09/1979 |
| 4131760 | Multiple microphone dereverberation system A circuit for reducing reverberative interference utilizes a pair of spatially separated microphones to obtain speech signals from a common sound source. Each speech signal is transformed into an envelope representative signal having rapid increases respo... | 12/26/1978 |
| 4071695 | Speech signal amplitude equalizer A speech signal amplitude equalizer (compressor) circuit normalizes the amplitude variations of a real-time input speech signal s(t) to form the normalized output signal r(t) which may be either of two values: a constant amplitude (unilevel) speech signal... | 01/31/1978 |
| 4048443 | Digital speech communication system for minimizing quantizing noise A digital speech communication arrangement includes apparatus for partitioning a speech signal into a plurality of nonuniformly related, preassigned intelligibility contributing subbands, and quantized with an accuracy (bit allocation) based upon perceptu... | 09/13/1977 |
| 4046225 | Cable lubrication method A method for applying lubricant to the surface of a cable in which the cable is inserted into a lubricant filled chamber through the deformably engaged aperture of a first flexible disc. Beads of lubricant from the chamber are applied to the cable surface... | 09/06/1977 |
| 4043891 | Electrolytic cell with bipolar electrodes In the electrodeposition of metals, the position and shape of the anode with respect to the cathode is critical for uniform deposition of the metal on the cathode. A bipolar electrode comprising a pair of electrically interconnected porous electrodes havi... | 08/23/1977 |
| 4032711 | Speaker recognition arrangement This speaker recognition system offers improved recognition by comparing the mean and variance of an unknown (test) speaker's Orthogonal Parameter signals versus those of previously-stored known (reference) speakers. The unknown speaker's Orthogonal Param... | 06/28/1977 |
| 4022974 | Adaptive linear prediction speech synthesizer A real-time predictive speech synthesizer produces an artificial speech signal from pitch period segmented codes. Responsive to the predictive parameters of the currently occurring pitch period, preceding speech samples, and the adjusted excitation signal... | 05/10/1977 |
| 4020332 | Interpolation-decimation circuit for increasing or decreasing digital sampling frequency A general purpose interpolator-decimator circuit for increasing or decreasing the sampling rate of a digital signal by a factor L/M, where L and M are integers, is disclosed. The circuit includes means for determining each output sample by multiplying a s... | 04/26/1977 |
| 4017847 | Luminous indicator with zero standby power In a luminous indicator circuit, a plurality of luminous elements are connected in series relation to form a series circuit which is supplied through a constant current device. A solid state switching device is placed in parallel with each luminous elemen... | 04/12/1977 |
| 4015222 | Modulated passband signal generator Disclosed is apparatus for generating carrier signals modulated by baseband symbol signals. The disclosed apparatus includes samplers for sampling input symbol signals, multipliers for multiplying the sampled signals by a precessing phase that is a functi... | 03/29/1977 |
| 4015088 | Real-time speech analyzer Apparatus for the real-time analysis of speech signals in which a digital signal representative of the speech signal is adaptive threshold center-clipped and infinite peak-clipped to form a signal comprising three logic states (+1,0,-1). The autocorrelati... | 03/29/1977 |
| 4012628 | Filter with a reduced number of shift register taps Disclosed is a discrete-time filter configuration employing a shift register having output taps at only preselected stages for developing an output signal that is responsive to the signal of each stage of a shift register. The desired output signal is com... | 03/15/1977 |
| 4008376 | Loudspeaking teleconferencing circuit A loudspeaking teleconferencing circuit serving a plurality of remote conference room locations includes a plurality of speakerphone sets at each conference room location and a communication network connected to an incoming and an outgoing terminal at eac... | 02/15/1977 |
| 4002381 | Card mounting assembly A component card assembly includes a grooved guide adapted to interengage a component card edge between the card receiving and base ends of a support frame. The guide is fixedly attached to the frame base end and comprises an elastically elongatable secti... | 01/11/1977 |
| 3991297 | Electrically heated soldering device A tool adapted to simultaneously heat a plurality of spaced electrical elements for soldering includes a rigid low conductivity metallic strip connected between and holding first and second relatively massive high conductivity bars in spaced, parallel rel... | 11/09/1976 |
| 3980383 | Multiplane terminal block A multiplane terminal block adapted to provide rearrangeable electrical connections includes a plurality of spaced insulating terminal posts extending outwardly on one side of a rectangular block of insulating material. A conductive element fixedly insert... | 09/14/1976 |
| 3932716 | Latch and switch actuator interlock safety structure for electronic component module operable during insertion and removal of connector members An actuator controlled switch mounted on an electronic component module is operative to remove electrical power from the module during plug-in or removal of the module from a support frame. A latch and the actuator are pivotally mounted in parallel relati... | 01/13/1976 |
