Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
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| Number | Title | Issue Date |
| 4745474 | Two resolution level DPCM system A digital television transmitter has a buffer that receives a low resolution low pass filtered signal. A high resolution high pass filtered signal is applied to the buffer only when the buffer can accept it without overflowing. A digital television receiv... | 05/17/1988 |
| 4745599 | Random access communication system with contention scheduling of subpacketized data transmissions and scheduled retransmission of unsuccessful subpackets A random access communication system forms messages to be transmitted into subpackets of fixed duration. A message packet includes two or more subpackets. Each subpacket includes information relating to the source transmitter-receiver and the number of su... | 05/17/1988 |
| 4706260 | DPCM system with rate-of-fill control of buffer occupancy In a differential pulse code modulator for image-representative signals, a coder codes difference signals to produce coded signals which have a highly variable rate, which depends upon motion in the image being represented. A rate buffer receives the code... | 11/10/1987 |
| 4701241 | Method of making a resistor A method of forming a resistor comprises forming a conducting layer on a substrate. An area of the layer is removed such as by etching. A resistor portion is formed in the area. The conducting layer including the resistor portion can be p-Si. The substrat... | 10/20/1987 |
| 4700226 | Rate buffer control of predicted signal decimation and interpolation for adaptive differential pulse code modulator A predictive coding signal communication arrangement includes, at the transmitter, a subtractor for subtracting delayed predicted signals from current input signals to produce difference signals. Predicted signals are generated by adding the difference si... | 10/13/1987 |
| 4697689 | Article manipulation system A system for manipulating articles, such as irregular mailpieces in the U.S. Postal Service mail processing system, receives an agglomeration of parcels into a first subsystem where the parcels are separated and are passed to a second subsystem where each... | 10/06/1987 |
| 4697159 | Tuning capacitors with selectable capacitance configurations for coupling between microwave circuits A tuning capacitor arrangement for a microwave circuit including, on a substrate, first and second conductors to be capacitively joined. The tuning capacitor arrangement includes first and second capacitors each having connective tabs terminating on the s... | 09/29/1987 |
| 4691310 | Compact disk read only memory recording system with speed control Digital computer data recorded in a spiral track on the surface of a disk using a laser recording head which moves radially across the disk as it revolves at a constant linear velocity. A system for controlling the disk velocity during the recording proce... | 09/01/1987 |
| 4687730 | Lift-off technique for producing metal pattern using single photoresist processing and oblique angle metal deposition A process of forming sub-micrometer metallization structures on a substrate is provided. A layer of a photoresist on the structure is pattern irradiated with a reduced dosage of actinic radiation so that, upon development, recesses are formed therein whic... | 08/18/1987 |
| 4688213 | Asynchronous random access communication system with collision resolution based on time of arrival An asynchronous random access system includes stations which in one embodiment transmit information as packets at random times. After a path delay, all stations receive the packets. By comparing the period of activity at the station with the known packet ... | 08/18/1987 |
| 4684983 | Non-linear processor for reducing the dynamic range of a digitized error signal In systems in which the current digitized level value of a synthesized-signal sample (e.g., a television video signal sample) is determined by summing a transmitted error-signal-sample level value and a delayed previous synthesized-signal-sample level val... | 08/04/1987 |
| 4682055 | CFET inverter having equal output signal rise and fall times by adjustment of the pull-up and pull-down transconductances A circuit comprises P-channel and N-channel field effect transistors. A conduction electrode, such as a drain, of one of the transistors is coupled to a conduction electrode of the other transistor. Means are provided for ensuring that the currents in the... | 07/21/1987 |
| 4675978 | Method for fabricating a radiation hardened oxide having two portions A method for making a partially radiation hardened oxide comprises forming a first portion of an oxide layer on a semiconductor body of material at a temperature between about 950° C. and 1400° C., preferably between about 1000° C. and 1200° C. Therea... | 06/30/1987 |
| 4677393 | Phase-corrected waveguide power combiner/splitter and power amplifier A waveguide power combiner or splitter (divider) includes a common waveguide having an axis skewed relative to the axes of a line array waveguides. A sectoral parabolic reflector is oriented with its focus at a port of the common waveguide with its axis p... | 06/30/1987 |
| 4675628 | Distributed pin diode phase shifter A monolithic chip phase shifter consists of a PIN diode which is laterally elongated and shaped into a microstrip-like transmission line. The transmission line has characteristics determined in part by the capacitances associated with the intrinsic layer ... | 06/23/1987 |
| 4675624 | Electrical phase shifter controlled by light A TEM-mode transmission line such as a microstrip or coplanar line includes a pair of conductors, at least one of which is elongated. A semiconductor junction or junctions are coupled across the conductors. If a single junction is used, the junction may b... | 06/23/1987 |
| 4599652 | Dual channel IF TV receiver with AFT derived from the picture carrier in the sound channel A quasi-parallel IF television receiver derives the AFT voltage from a video carrier in the sound IF channel. Since the signals in the sound IF channel do not pass through the VSB filter, asymmetries in the AFT loop response are avoided. This results in b... | 07/08/1986 |
| 4575757 | PAL offset generator A color subcarrier generator for PAL uses a one-quarter horizontal frequency signal from a sync generator to sample the subcarrier signal. The sampled signal is phase and frequency compared with a 25 Hz (one-half vertical frequency) signal from the same s... | 03/11/1986 |
| 4562472 | Double conversion tuner with split IF output A double conversion television tuner has first and second mixers and uses both the sum and difference frequency signals from the second mixer. The picture component of the difference frequency is separated from the output of the second mixer using a first... | 12/31/1985 |
| 4555163 | Complementary color splitting filters used in a color camera A color beam splitter splits the incoming light into complementary colors such as yellow, magenta, and cyan for improved colorimetry. Stripes are used so that no light is absorbed and therefore a high S/N ratio is achieved. The stripes can be on mirrors o... | 11/26/1985 |
| 4536223 | Method of lowering contact resistance of implanted contact regions The resistance between a conductive contact and a region of relatively high conductivity in a body of semiconductor material is lowered by forming the high conductivity region by implanting ions of a desired conductivity type into the semiconductor body t... | 08/20/1985 |
| 4525750 | Automatic tracking system for multitrack recorders An automatic tracking system for a VTR has playback heads having widths smaller than the recorded track widths. At least two tracks are simultaneously reproduced. If mistracking occurs, the amplitude of the reproduced signal from one head decreases, while... | 06/25/1985 |
| 4523227 | System for synchronizing a video signal having a first frame rate to a second frame rate A synchronizer receives from a tape playback arrangement television frames at a rate which is slightly higher or slightly lower than a standard frame-rate. The synchronizer includes four frames of storage, and reading and writing are continuous. In a mode... | 06/11/1985 |
| 4523158 | Clock regenerator using two on-off oscillators A clock pulse regenerator uses a pair of oscillators each comprising a NOR gate and a transmission line feedback element. The oscillators are provided with complementary data pulses and provide an output signal only when the data signal is of a selected l... | 06/11/1985 |
| 4518996 | Synchronization system that uses all valid signals A synchronization system for serial digital television signals compares successive sync signals to form an error signal and also delays the digital signals. The information signal delay is changed during loss of signal by an amount in accordance with the ... | 05/21/1985 |
| 4510564 | Synchronously detected DC/DC converter for regulated power supply A regulated power supply has a synchronous detector in a voltage regulator feedback loop. The detector is coupled to a secondary of a transformer to detect the AC voltage. The result is faster response time to a step change in the primary voltage and all ... | 04/09/1985 |
| 4510501 | Broadband loop antenna with low wind resistance An antenna for CP signals uses a reflector, such as a truncated pyramid. Feed tubes, which act as a balun extend from the pyramid. Four truncated square loops are coupled to the feed means. The truncation results in a smaller radome being used and hence s... | 04/09/1985 |
| 4504869 | Color moviola for two-track VTR When in the high or low speed editing or "moviola" mode, a VTR switches the inputs of Y and C demodulators between the Y and C heads or switches the demodulator outputs as the heads cross tracks. Thus, the Y and C demodulators always receive or provide at... | 03/12/1985 |
| 4358788 | Legibility for alpha-mosaic characters In add-on alpha-mosaic character (teletext) decoders, the character signals pass through the limited bandwidth chroma channel of the TV receiver. For certain color combinations and signal durations this reduces legibility and contrast due to pulse stretch... | 11/09/1982 |
| 4355324 | Sampled or digitized color in a high speed search record and replay system Moviola color picture quality is improved for a record and replay system wherein video sampled at a predetermined multiple of the color subcarrier frequency is recorded with each frame or field being disposed on a set of multiple tracks and with only a po... | 10/19/1982 |
| 4336615 | Linear loading for PWM filter An AM broadcast transmitter uses a PWM modulator that requires a pulse width filter. It has been found that the filter load varies over the modulation cycle resulting in distortion. To overcome this problem, a varying voltage is applied to an RF driver st... | 06/22/1982 |
| 4335402 | Information transmission during first-equalizing pulse interval in television A teletext system transmits auxiliary information before the vertical sync pulse in the vertical blanking interval to avoid interference to the normal transmitted picture. At the transmitter a time gap is placed in the auxiliary information to allow for t... | 06/15/1982 |
| 4335408 | Digital tracking system A tracking system for a VTR features digital circuitry, such as a counter, for immunity to component tolerances and power supply voltage shifts. It also allows holding a constant control voltage when desired. A tachometer input signal need not be converte... | 06/15/1982 |
| 4335412 | Triax safety circuit A safety circuit prevents shocks, and is particularly useful with a television camera head and processing unit that are connected by a triaxial cable. The circuit applies power to the triax at the processing unit. If the current is interrupted, the power ... | 06/15/1982 |
| 4334237 | Adaptive amplitude averaging for weighting quantizing noise An apparatus reduces quantizing noise by averaging picture information when only low frequency information is present. Thus, high frequency detail is not lost. This is determined by looking at proximate samples to see if their amplitudes are within a sele... | 06/08/1982 |
| 4323916 | Data rate reduction for digital video signals by subsampling and adaptive reconstruction A digital TV system reduces the data rate by transmitting or recording only bytes representing half of the sampled pixels. Steering bits are also transmitted that tell which of the transmitted bytes are the closest match to the untransmitted bytes so the ... | 04/06/1982 |
| 4320416 | Technique for optimally encoding digitally encoded video signals An encoder for digital video signals uses averages of pairs of transmitted samples to reconstruct untransmitted samples. The pair selected for reconstruction is selected in accordance with the criteria of least change around the untransmitted sample. If a... | 03/16/1982 |
| 4316219 | Synchronizing circuit adaptable for various TV standards A sync generator uses ROMs addressed by counters to synthesize various television sync waveforms. The ROMs can be changed or reprogrammed to generate sync signals for different standards. By dividing the sync signals into four intervals which are selected... | 02/16/1982 |
| 4301458 | Antenna array with impedance matching using mutual coupling A circularly polarized antenna has bays stacked at spacings of less than one wavelength in order to have a broadband SWR characteristic and to minimize radiation along a supporting mast axis. Vertical stubs are used to increase the circularity of the hori... | 11/17/1981 |
| 4297706 | Circularly polarized slotted pylon antenna A circularly polarized antenna uses at least one pair of slots disposed at right angles to each other and cut into a vertical conducting mast to radiate the signal. The slots are vertically spaced about one half of a wavelength from each other to eliminat... | 10/27/1981 |
