Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 4316107 | Multiplier circuit A multiplier circuit for controlling gain amplification of an electrical input signal responsively to a control signal comprises log conversion means for producing a log signal as a logarithmic function of the input signal, means for producing a multiplie... | 02/16/1982 |
| 4308471 | Product circuit A product or multiplier circuit for use in an FM quadrature detector including a double-balanced differential amplifier having resistors disposed in the emitter circuits thereof. Product signals formed at collector junctions of the differential amplifier ... | 12/29/1981 |
| 4247789 | Electronic circuitry for multiplying/dividing analog input signals An electronic circuit adapted to multiply/divide analog input signals, such circuit having a first set of four transistors with serially coupled base-emitter junctions arranged to produce an output current in the collector electrode of one of such transis... | 01/27/1981 |
| 4243898 | Semiconductor temperature sensor A temperature sensor circuit is disclosed which employs a plurality of semiconductor junctions arranged either in a current-mirror configuration or a bridge configuration in order to provide a differential output voltage which is linearly proportional to ... | 01/06/1981 |
| 4242634 | Electronic multiplying circuits An electronic multiplying circuit, primarily intended for use in an electronic watthour meter, comprises a variable-transconductance multiplier of the type comprising two emitter-coupled pairs of transistors, the collectors of one pair being cross-coupled... | 12/30/1980 |
| 4234842 | Voltage regulator and flicker compensator A voltage regulator and flicker compensator is taught which utilizes a simulated light bulb in the feedback control. The simulated light bulb utilizes an analog voltage squaring module the output of which is filtered to reduce the second harmonic of the i... | 11/18/1980 |
| 4224537 | Modified semiconductor temperature sensor A temperature sensor circuit is disclosed which employs a plurality of semiconductor junctions arranged either in a current-mirror configuration using a bias circuit and current source transistors or in a bridge configuration in order to provide a differe... | 09/23/1980 |
| 4214174 | Voltage multiplier employing clock gated transistor chain A voltage multiplier circuit arrangement comprises a plurality of transistors connected a series between an input and an output of said arrangement, and first and second input lines arranged to have differential alternating voltage applied between them. S... | 07/22/1980 |
| 4157512 | Electronic circuitry having transistor feedbacks and lead networks compensation An electronic circuit including an amplifier having an input adapted for coupling to an analog signal source; a current source coupled to the output of the amplifier; a feedback transistor having a collector electrode and emitter electrode connected in se... | 06/05/1979 |
| 4156924 | CMOS Analog multiplier for CCD signal processing An analog multiplier for multiplying the signals derived from a charge coupled device (CCD) tap includes a balanced multiplier of a first conductivity-type and a buffer of a second conductivity-type coupled between the CCD tap and the balanced multiplier.... | 05/29/1979 |
| 4156284 | Signal processing apparatus Apparatus for performing matrix mutiplication of a plurality (n) of input signals by a matrix of fixed coefficients (nm) to provide a plurality (m) of output signals, all of which are simultaneously available, is described.... | 05/22/1979 |
| 4125811 | Circuit for multiplying two variables A circuit for multiplying two variables wherein one variable is represented by the pulse width of the pulses of a variable pulse width, constant frequency rectangular waveform signal and the second variable is represented by the level of a variable amplit... | 11/14/1978 |
| 4118787 | Analog multiplier error corrector, notably for precision wattmeters An error correcting device for a multiplier of the time-division multiplication type comprising a modulator, a switch and a filter. Another switch is responsive to a time-base delivering periodically a zero signal to the modulator; a circuit memorizes and... | 10/03/1978 |
| 4110834 | Method and circuit arrangement for the multiplication of electrical signals A method for the multiplication of electrical signals comprises modulating the signals to be multiplied with functions having positive and negative values, multiplying the modulated signals together, demodulating the resulting product with demodulation fu... | 08/29/1978 |
| 4110833 | Balanced AC correlator system A system having a pair of input signals, one of which is modulated and transformed into a pair of signals phased 180° apart. These signals are acted on by a FET correlator where the second input signal controls the FET gate. Correlator output is amplifie... | 08/29/1978 |
| 4105900 | Signal selection apparatus for redundant signal sources Apparatus for signal selection and signal consolidation of the redundant sensor signals in a triply redundant control system wherein one of the redundant sensors supplies precise information and the remaining two sensors supply less precise information is... | 08/08/1978 |
| 4091453 | Low offset AC correlator A low offset AC correlator avoids DC offset and low frequency noise by frequency operating the correlation signal so that low noise, low level AC amplification can be substituted for DC amplification. Subsequently, the high level AC signal is demodulated ... | 05/23/1978 |
| 4075697 | Apparatus for monitoring two electric quantities by combining three consecutive samples of each quantity Apparatus for monitoring two sinusoidal electric quantities of a common period, comprises two similarly timed samplers, an arithmetic unit for combining, in accordance with a preselected relation, three consecutive samples of each electric quantity so as ... | 02/21/1978 |
| 4074194 | Watt meter providing electrical signal proportional to power A watt meter circuit capable of providing an electrical signal indicative of power includes a signal forming means for providing a pair of signals proportional to current. The signals are equal to each other in magnitude but opposite in polarity and are p... | 02/14/1978 |
| 4071777 | Four-quadrant multiplier Circuit employing complementary field-effect transistors operated in the triode mode. A signal representing the multiplicand is applied to the gate electrode of one transistor and a signal representing the multiplier is applied to the drain electrode of t... | 01/31/1978 |
| 4042815 | Electronic multipliers A multiplier circuit arrangement comprises two parallel paths for the same signal, one of the paths being associated with signal level adjusting means; and means responsive to inbalance of d.c. components including any in said parallel paths, the inbalanc... | 08/16/1977 |
| 4039897 | System for controlling power applied to a gas discharge lamp A system for controlling power applied to a gas discharge lamp by an AC source, wherein the power dissipated in the lamp during a half cycle is sensed by a measuring circuit. The measuring circuit provides output signals proportional to the current throug... | 08/02/1977 |
| 4039868 | Circuit for generating pulses with duration proportional to quotient of two input voltages First and second transistors are connected in a monostable multivibrator configuration. A capacitor is coupled between the collector of the first transistor and the base of the second transistor. A first control voltage is applied to the collector of the ... | 08/02/1977 |
| 4038566 | Multiplier circuit A gain control or multiplier circuit in which an ac signal is applied through bipolar diodes having logarithmic response characteristics to the bases of bipolar transistors connected in series and having an output at their junction, the diodes being direc... | 07/26/1977 |
| 4015140 | Multiplier for producing phase shift error-free signal representing product of out-of-phase inputs Metering kWh in an electrical system is accomplished by generating pairs of analog signals, representing current and voltage variables. Each pair of analog signals is multiplied together in a direct pulse-width conversion in a time-division multiplier net... | 03/29/1977 |
| 4006353 | Signal multiplier devices A signal multiplier for multiplying first and second input signals each having time-varying amplitudes and relatively wide bandwidths in which a first input signal is added to at least one sinusoidal reference signal having an amplitude larger than that o... | 02/01/1977 |
| 4005284 | Analog signal to duty cycle conversion apparatus An analog signal to duty cycle converter and/or multiplier utilizing an integrator which integrates a composite of an input voltage and a feedback signal to produce a triangular waveform. The triangular waveform, depending upon the polarity of the input s... | 01/25/1977 |
| 4004141 | Linear/logarithmic analog multiplier An analog device for generating an output signal which is proportional to the linear product between a first input signal and the antilogarithm of the second input signal, and comprising a means for applying the second input signal simultaneously and iden... | 01/18/1977 |
| 3997845 | Device for modifying an analog electric signal A device for modifying an analog electric signal and producing a modified analog electric signal being a pre-selectable non-linear function of the first signal comprises a plurality of amplifiers having individually variable gains. All amplifiers, possibl... | 12/14/1976 |
| 3981586 | Continuously monitoring ratiometer An analytically significant ratio between timevarying magnitudes of signals is periodically monitored in recurring cycles which are each synchronized with a frequency generator. During every monitoring cycle, each signal relating to the numerator and deno... | 09/21/1976 |
| 3976941 | Auto-ranging system for an electronic energy meter An auto-ranging system for an electronic watt-hour meter includes a current transformer for measuring the electrical current in at least one line of an electrical power consuming system. The measured current is converted to a voltage which is proportional... | 08/24/1976 |
| 3970774 | Electronic signal mixer An electronic signal mixer is provided for combining first and second signals by additively (or differentially) combining the first and second signals to provide a first output signal. The first and second signals are further combined in a multiplier circ... | 07/20/1976 |
| 3961257 | Single phase 3-wire electronic electrical energy meter Metering kWh in a single phase, 3-wire, FL Hertz a.c. electrical system is accomplished by detecting the current flow in two lines of the three-wire system by means of a current transformer having two primary windings and a single secondary win... | 06/01/1976 |
| 3956624 | Method and device for the storage and multiplication of analog signals In a method and a device for multiplying analog signals in integrated circuit elements, the memory elements are constituted by field-effect transistors having a number of layers of different dielectrics between the gate and the doped semiconductor substra... | 05/11/1976 |
| 3955096 | Implicit ratio computer for sequential signals An electrical signal ratioing circuit for a source delivering an electric analog pulse signal sequence having compensating means for removing the effects of background influences, such as amplifier signal offsets and extraneous illumination, and integrati... | 05/04/1976 |
| 3953852 | Wide bandwidth phase scanning with simple controls A modified Huggin's Scanner whose tunable signal bandwidth can be broadened ithout affecting the beam position and whose output beam direction is dependent on the control of a resistor. Two separate voltage controlled oscillators are utilized in this syste... | 04/27/1976 |
| 3947675 | Computer interactive resistance simulator (CIRS) A system for simulating the insertion of electric resistance values of either positive or negative quantity into an electric circuit and for cancelling drift errors therefrom.... | 03/30/1976 |
| 3938038 | Method and apparatus for providing primary coincidence correction during particle analysis A method and apparatus are disclosed wherein each particle pulse developed in response to passage of particles in a particulate system through a sensing zone is integrated to develop a first voltage whose amplitude varies in accordance with the number of ... | 02/10/1976 |
| 3935539 | A-C signal multiplying circuit by a ratio of whole numbers the numerator of which is greater than one and greater than the denominator A digital frequency correlator circuit for comparing the frequencies of a urality of a-c signals to determine if they are coherent within a predetermined number of cycles. The a-c signals are converted into digital numbers representing their frequencies. ... | 01/27/1976 |
