Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7271993 | Control of current in an inductance with pulse width modulation at control frequency A PWM controller for a bridge driver circuit for controlling current in an inductive load such as a motor, can set the driver into a forward mode, a slow decay mode or a fast decay mode, and can switch from slow decay mode into forward mode or into fast decay mode f... | 09/18/2007 |
| 7227387 | Measuring pulse edge delay value relative to a clock using multiple delay devices to address a memory to access the delay value A pulse width measurement system is provided with components in an FPGA so that pulse widths can be measured that are smaller than the frequency limits of the FPGA system clock. For the measurement, an incoming pulse is fed into the FPGA to many (e.g. 32) I/O inputs... | 06/05/2007 |
| 7106116 | Pulse duty deterioration detection circuit A pulse duty deterioration detection circuit with a high monitoring precision is easily provided. The pulse duty deterioration detection circuit comprises a delay circuit comprised of a general-purpose gate circuit which generates a delayed synchronous to-be-monitor... | 09/12/2006 |
| 6960951 | Circuit for detecting a logic transition with improved stability of the length of a detection signal pulse A circuit for detecting a logic transition is proposed. The circuit includes an input terminal for receiving a logic signal, an output terminal for generating a detection signal, two capacitors, in a steady condition a first one of the capacitors and a second one of... | 11/01/2005 |
| 6959031 | Method and system for fast acquisition of pulsed signals A method and system for fast acquisition of pulsed radio signals where said signals comprised uniquely-spaced pulses or symbols. The receiver searches for and detects two ore more symbols, determines the interval or intervals between the symbols, and because the int... | 10/25/2005 |
| 6903591 | Phase shifter circuit A phase shift circuit that generates a phase shift signal whose amplitude matches at a plurality of frequencies without increasing the circuit area. The phase shifter circuit includes first and second differential amplifiers which generate first and second first pha... | 06/07/2005 |
| 6791367 | Hardware and software programmable fuses for memory repair The present invention relates to a system and method for increasing the manufacturing yield of a plurality of memory cells used in cell arrays. A programmable fuse, having both hardware and software elements, is used with the plurality of memory cells to indicate th... | 09/14/2004 |
| 5995444 | Edge transition detection control of a memory device The pulse width of an internal edge transition detection signal of a memory device is selectably varied by varying the logic state of one or more control signals of the memory device. A number of edge transition detection signals generated by input buffer... | 11/30/1999 |
| 5923191 | Device and a method for monitoring a system clock signal A system clock signal monitor that monitors a system clock signal by comparing a pulse width of a logic high pulse and a pulse width of a logic low pulse of each system clock duty cycle of the system clock signal to one or more reference clock duty cycles... | 07/13/1999 |
| 5696463 | Address transition detecting circuit which generates constant pulse width signal An address transition detecting circuit comprising a first address transition detecting stage for generating a first address transition detection signal, the first address transition detection signal having a pulse width which is constant and stable when ... | 12/09/1997 |
| 5686855 | Process monitor for CMOS integrated circuits A process monitor for a CMOS integrated circuit includes first and second delay units that are connected in a ring to constitute a ring oscillator that generates pulses having different phases at the outputs of the delay units respectively. The delay unit... | 11/11/1997 |
| 5631596 | Process monitor for CMOS integrated circuits A process for evaluating acceptability of a digital circuit having a first type of circuit element for a first change of state and a second type of circuit element for a second change of state, the process comprising: generating a leading edge of a first ... | 05/20/1997 |
| 5486786 | Process monitor for CMOS integrated circuits A process monitor for a CMOS integrated circuit includes first and second delay units that are connected in a ring to constitute a ring oscillator that generates pulses having different phases at the outputs of the delay units respectively. The delay unit... | 01/23/1996 |
| 5479118 | Pulse width discriminating circuit A pulse width discriminating circuit comprises an edge detecting circuit receiving an input signal for generating a detection signal when the input signal rises up, first to third counters each cleared by the detection signal and counting a different coun... | 12/26/1995 |
| 5430403 | Field effect transistor with switchable body to source connection To avoid forward biasing the diodes within an N-channel transistor, the body and source of the N-channel transistor are switchably connected via a high-voltage FET. The gates of the N-channel transistor and high-voltage transistor are connected together s... | 07/04/1995 |
| 4857760 | Bipolar glitch detector circuit A circuit for detecting positive and negative pulses of a predetermined maximum duration of an input signal includes a first monostable circuit for generating a first pulse having a duration equal to the predetermined maximum duration when a positive-goin... | 08/15/1989 |
| 4745365 | Digital receiver with dual references A pair of comparators is provided with attenuated input signals. Each comparator is provided with a different reference level so that two sets of complementary digital outputs may be obtained with different pulse widths. Hysteresis control is provided to ... | 05/17/1988 |
| 4710653 | Edge detector circuit and oscillator using same A circuit useful as an edge detector or pulse width encoder which receives an input signal and supplies a logic output signal includes a delay and inverting circuit for logically inverting and delaying input signals so as to supply a delayed and inverted ... | 12/01/1987 |
| 4670665 | Digital pulse width detector Apparatus for passing digital pulses from a bilevel digital signal source having widths wider than a given minimum and narrower than a given maximum is described. A first duration sensitive signal gate is coupled to the signal source and passes only signa... | 06/02/1987 |
| 4634984 | Duration-sensitive digital signal gate One-bit stream of clocked control information is applied to the input of delay means, having a succession of signal takeoff points, with the delay between successive takeoff points being the same (e.g., twice a period at the clocking frequency, fCL | 01/06/1987 |
| 4583008 | Retriggerable edge detector for edge-actuated internally clocked parts A retriggerable edge detector is provided having a means for receiving digital input signals, at least two signal transmitting paths connected to that signal receiving means, one of which paths transmits the input signal with predetermined delay, output g... | 04/15/1986 |
| 4571514 | Amplitude adjusted pulse width discriminator and method therefor An amplitude adjusted pulse width discriminator and method therefor wherein a received video pulse is sampled and held when it crosses a threshold. An indication of a valid pulse being present is given if the level of the signal at the input is within a p... | 02/18/1986 |
| 4475086 | Duty cycle detector Apparatus is disclosed for determining whether the duty cycle of a periodic signal produced by an incremental encoder is within a predetermined acceptable range. The apparatus includes an oscillator which produces clock pulses at a substantially higher fr... | 10/02/1984 |
| 4403193 | Pulse detection circuit A pulse detection circuit, for detecting pulses contained in output signals derived from an encoder such as rotary encoder which converts any physical quantity like spatial position, displacement or length into an electric signal, is disclosed. The disclo... | 09/06/1983 |
| 4399412 | Duty cycle monitor circuit A duty cycle monitor circuit which detects variations in the duty cycle of a monitored pulse by comparing its duty cycle with the pulse width of an external reference signal. A detection circuit detects the duty cycle variation of the monitored pulse afte... | 08/16/1983 |
| 4223267 | Circuit arrangement for measuring pulse widths A pulse width measuring apparatus including a threshold-level trigger, which receives the pulses to be measured and a threshold voltage. At the instant at which the pulse voltage exceeds the threshold voltage the threshold-level trigger starts a time-meas... | 09/16/1980 |
| 4214270 | Digital vertical sync signal separator A signal detector circuit comprises a plurality of series-connected data latch circuits. An input signal and clock signals are applied to the first data latch circuit, the clock signals being effective to shift the input signal along the succeeding data l... | 07/22/1980 |
| 4086538 | Gated pulse generator A gated pulse generator produces on output pulse for every period in which an input signal is continuously in a particular state for longer than a minimum gating interval. If the input signal changes state within the minimum gating interval, no output pul... | 04/25/1978 |
| 3984694 | Pulse width regulator for a pulsed neutron source A pulsed neutron system includes an accelerator tube having a target, an ionization section, and a replenisher for supplying accelerator gas. The power supplied to the replenisher is controlled to maintain the ionization pulse time duration within the upp... | 10/05/1976 |
| 3980960 | Signal width and width ratio determining apparatus Apparatus for determining whether the ratio of the widths of a pair of signals is within acceptable limits including integrator means, including a first integrator responsive to a first signal to integrate in a first direction at a first rate and to a sec... | 09/14/1976 |
| 3949293 | Apparatus and method for detecting a moving metal mass including means to discriminate signals having a particular period In an electronic detection system, signals indicative of a detected mass of material are related to a selected mass velocity and a detection aperture through which the mass is moved. The pulse output signal from the detector, exhibiting a period related t... | 04/06/1976 |
| 3944982 | Remote control system for electric apparatus A remote control system for selectively controlling plural functions of electric apparatus comprising a combination of an improved transmitter for generating a command signal of a single frequency which is transmitted intermittently for a plurality of int... | 03/16/1976 |
| 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 |
