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| Number | Title | Issue Date |
| 4920596 | Vehicle wheel elevating device A two level car wheel elevating device for elevating the front wheel (146) of a car having a bumper assembly (117) and comprising, first (100), second (102), third (104), and a fourth (106) top level wheel tread segments joined together to form a continuo... | 05/01/1990 |
| 4886003 | Embroidering tool An embroidering tool comprising first (18), second (23), third (25), and fourth (30) longitudinal and generally cylindrical elements coaxially arranged and each with a longitudinal bore-like cavity (22, 17, 13, and 36) extending therethrough with the firs... | 12/12/1989 |
| 4872552 | Safety packaging for hypodermic syringes with needles and the like A safety package (54) for preventing accidental skin pricking by a hypodermic syringe type needle (16) having a needle hub (14) joining the needle (16) to the syringe (18) and comprising a first tubular section (12) securable at its first end to the needl... | 10/10/1989 |
| 4485477 | Fast frequency/code search A decoder for decoding received pseudo random sequence (PRS) codes modulated upon a carrier signal and having an original chip rate fc, and for correcting for unknown frequency shifts in the received PRS codes. The decoder includes a local osci... | 11/27/1984 |
| 4412302 | Digital phase demodulation and correlation A system for digitally detecting the energy content of a received analog signal of frequency fc. The system comprises signal means for generating sampling pulses of repetition rate 4 fc, a first two level signal of frequency 2 f... | 10/25/1983 |
| 4404627 | Interrupt signal generating means for data processor An interrupt signal generating means comprising a digital-to-analog (D/A) converter and means for supplying to said D/A converter a series of binary numbers at least some of which point to service subroutines in a data processor, and when converted to dc ... | 09/13/1983 |
| 4393444 | Memory addressing circuit for converting sequential input data to interleaved output data sequence using multiple memories A system for converting sequentially received data words, in the form of successively received groups of data words, into an interleaved output data word sequence, with each group of received data words consisting of T successive series of R data words. T... | 07/12/1983 |
| 4387341 | Multi-purpose retimer driver A general purpose retiming circuit comprising a timing signal source for generating timing signals, a plurality of N registers arranged in a row in a given order with each register having an input terminal, an output terminal, and clock input terminal and... | 06/07/1983 |
| 4379221 | Circuit for detecting phase relationship between two signals A circuit for detecting leading or lagging phase relationship between first and second two-level input signals at each level transition of a selected one of the input signals and comprising first and second Exclusive OR gates each having first and second ... | 04/05/1983 |
| 4374428 | Expandable FIFO system A FIFO system comprising an expandable number of identical FIFO chips identically interconnected to form a ring with each FIFO chip comprising a RAM memory with inboard and outboard pointing logic which, when activated, direct the writing or readout of wo... | 02/15/1983 |
| 4374438 | Digital frequency and phase lock loop An improved jitter-free system for phase locking a locally generated signal with a received signal. The system provides and arithmetic synthesizer having a clock signal source which clocks a binary increment contained in an input register into the digital... | 02/15/1983 |
| 4370726 | Signal correlation means employing charged-coupled device type shift registers A system for correlating a sampled received analog signal against a sampled reference waveform which is approximated by three quantized levels. The three levels are organized to minimize undesirable odd harmonics with the reference and to maximize the cor... | 01/25/1983 |
| 4370653 | Phase comparator system An improved interrogation means in a range finding system having signal generating means for generating interrogation signals having a first encoded portion and a first basic tone portion. A transponder means responds to said interrogation signal to gener... | 01/25/1983 |
| 4365202 | Duty cycle generator with improved resolution A digitized duty cycle pulse generator capable of resolution finer than the period of the available source clock signal. The invention comprises a means for generating a clock pulse signal having a repetition of fc, counter means responsive to ... | 12/21/1982 |
| 4363050 | Digitized audio record and playback system A system for digitally processing an analog signal, such as an audio signal, for recording and playback. The system comprises means responsive to the analog signal to produce sequences of binary 1's for those portions thereof whose amplitude exceeds a giv... | 12/07/1982 |
| 4352313 | Musical keyboard for home computer A very inexpensive computer input device for music information includes a piano-type keyboard unit adapted to be fastened on to a standard alpha-numeric computer keyboard so that manual "playing" of music on the piano keyboard results in actuation of alph... | 10/05/1982 |
| 4349887 | Precise digitally programmed frequency source A digitally controlled oscillator for generating a plurality of signals spaced apart by very small frequency increments. The system comprises first means for generating a source signal of frequency fc, second means responsive to said first sign... | 09/14/1982 |
| 4328463 | Encoder for recording incremental changes A circuit for detecting leading or lagging phase relationship between first and second two-level input signals at each level transition of both of said input signals and comprising first and second voltage comparators each having first and second input te... | 05/04/1982 |
| 4323963 | Hardware interpretive mode microprocessor In a data processor system comprising memory means containing subroutines each having low level instructions with the last instruction being an INTERPRET instruction, and high level language instructions which point to the starting addresses of said subro... | 04/06/1982 |
| 4319273 | Television signal with encoded synchronizing signals A television system including a transmitter and a receiver and first logic means in said transmitter for generating a composite video signal whose only synchronizing signals consist of coded signals occurring during a predetermined portion of the vertical... | 03/09/1982 |
| 4317206 | On line quality monitoring A system for on-line detection of distortion in a received digital signal which is phase modulated at a data rate fd and which has a suppressed carrier frequency fc and without interrupting the signal. The system comprises means for ... | 02/23/1982 |
| 4316177 | Data classifier A classifying system for determining with which group of a plurality of groups of reference file words a data word most closely compares and comprising a plurality of groups of comparison means each constructed to simultaneously and individually compare a... | 02/16/1982 |
| 4316282 | Multichannel frequency translation of sampled waveforms by decimation and interpolation A system and method for frequency division demultiplexing a received broad band signal into km channels, each capable of containing a baseband signal component and comprising m descending tiers of identical channel division modules with the fir... | 02/16/1982 |
| 4315314 | Priority vectored interrupt having means to supply branch address directly In a computer system, a struture uses a method for rapidly accessing and executing a sub-routine selected in response to a service request from an external source. The system provides a storage unit containing the addresses of the sub-routines called for ... | 02/09/1982 |
| 4308500 | Incremental encoder for measuring positions of objects such as rotating shafts A circuit for determining each level transition of first and second two logic level input signals and their leading or lagging phase relationship at each level transition and comprising first and second signal level storage means each having first input m... | 12/29/1981 |
| 4307347 | Envelope detector using balanced mixer An envelope detector with an extended linear dynamic range. A first amplitude modulated carrier signal, which can be of an intermediate frequency, is supplied to a first input terminal of a mixer, preferably balanced. The said first signal is also amplifi... | 12/22/1981 |
| 4306308 | Symbols communication system A data communications system for transmitting and receiving 64 different audio-frequency signals representing 64 respective alpha-numeric code symbols. A synchronizing signal consists of three time-spaced bursts where each burst consists of three audio-fr... | 12/15/1981 |
| 4300039 | Incremental encoder A circuit for detecting each level transition of a first two-level signal of a given frequency and its leading or lagging phase relationship with a second two-level signal of said given frequency, and comprising signal level storage means having a data in... | 11/10/1981 |
| 4298982 | Fault-tolerant interface circuit for parallel digital bus A system for detecting and correcting a stuck condition on the bus lines of a parallel multi-channel data transmission system. The system comprises a transmitter for generating N data signal having first and second logic levels, a receiver for receiving s... | 11/03/1981 |
| 4291275 | Frequency demodulation system A demodulator for demodulating an encoded signal comprising first and second predetermined patterns of contiguous signal segments of frequencies f1 and f2. A first signal processing means comprises first correlation means including a... | 09/22/1981 |
| 4291269 | System and method for frequency discrimination A means and method for fast determination of the frequency of an input signal comprising mean for digitizing and storing the digitized bits of the input signal in an input register of N bits at a bite rate fc. Other means generate a series of d... | 09/22/1981 |
| 4278977 | Range determining system A range finding method and system comprising an interrogator and a transponder. The interrogator generates a signal with a first portion comprising a carrier signal amplitude modulated by a first two-level iterative pseudo random sequence (PRS) whose leve... | 07/14/1981 |
| 4267640 | System for ascertaining magnetic field direction A system for detecting magnetic field direction comprising a pair of orthogonally positioned rods each having a rectangular shaped BH curve, a switching winding, and detectors for detecting the switching of magnetic polarity of each rod to either of its r... | 05/19/1981 |
| 4247822 | Frequency translation means A method and means for translating frequencies, as for example, to correct a frequency error Ɗfd introduced into a carrier signal of frequency fc, comprising means for dividing the resultant signal frequency (fc +Ɗf... | 01/27/1981 |
| 4245336 | Electronic tone generator A digitized multifrequency tone generator comprising a memory having N readable word locations with each location containing an amplitude representing binary word, and with the total N binary words sequentially and collectively representing a period T | 01/13/1981 |
| 4224679 | Signal correlation means A means for reducing side lobe signals and noise signals generated in a correlator in N chip positions for correlating a received input signal with a reference signal. The coincidence and non-coincidence indicating signals of first and second halves of th... | 09/23/1980 |
| 4224536 | Stabilization of monolithic integrated circuit output levels One of several monolithically integrated circuits acts as a control element or sensor to supply a signal to control the power supply voltage so as to maintain a predetermined output level from the other monolithically integrated circuits. A separate outpu... | 09/23/1980 |
| 4220925 | Encoding analog signals into digital signals using a triangular reference Apparatus and method for converting an analog input signal to a digital signal by modulating the analog signal with a periodic triangular wave-shape signal to produce intermediate digital signals and Exclusive-ORing these intermediate signals with a squar... | 09/02/1980 |
| 4206457 | Color display using auxiliary memory for color information Method and circuit for controlling the color of dot elements in a raster scan display having a data memory for storing the state (on or off) of dot elements which are mapped onto the raster scan display and a smaller auxiliary memory for storing color inf... | 06/03/1980 |
| 4206424 | Digitized phase modulating means A digitalized phase modulating means in which a two level binary modulated sequence from a data source of bit rate fs is supplied to a pulse add/delete circuit. Also supplied to such pulse add/delete circuit is a train of clock pulses of freque... | 06/03/1980 |
