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.
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 |
| 8005451 | Filter circuit and radio communication apparatus There is provided with a filter circuit, including: an input terminal configured to input signals; a band stop filter configured to have a center frequency of input signals from the input terminal in a stop band and configured to reflect signals in the stop band tha... | 08/23/2011 |
| 7979042 | Generating phase shift based on adding two vectors with variable gains A radio frequency (RF) phase shifter having an RC-CR circuit that includes a first capacitor having a first capacitor node and a second capacitor node and a first resistor coupled between the first capacitor node and a ground. The RC-CR circuit also includes a secon... | 07/12/2011 |
| 7899426 | Degenerated passive mixer in saw-less receiver In a SAW-less receiver involving a passive mixer, novel degenerative impedance elements having substantial impedances are disposed in incoming signal paths between the differential signal output leads of a low-noise amplifier (LNA) and the differential signal input ... | 03/01/2011 |
| 7561864 | RF receiver with NLMS channel estimator and method therefor An RF receiver (12) includes a channel estimator (52). The channel estimator (52) includes a channel estimation filter (82), error signal generator (84), and normalized Least-Mean-Square (NLMS) filter-definition generator 86... | 07/14/2009 |
| 7466970 | Arrangement for dividing a filter output signal An arrangement for dividing the output signal of the antenna filter of a radio receiver to two different paths, such as two parallel low-noise amplifier branches of a base station. The divider circuit is physically integrated into a resonator-type antenna filter (RX... | 12/16/2008 |
| 7444129 | Comb-line wireless filter A comb-line wireless filter (5) includes an input end (505a), an output end (505b), a first transmission line (501b), a second and third transmission line (501a, 501c) each having a curved ... | 10/28/2008 |
| 7352911 | Method for bilateral filtering of digital images A method for processing an image using a bilateral filter. The bilateral filter is reformulated at each pixel location in the image into a sum of the original signal value of a central pixel at said pixel location and a bilateral correction term which is a function ... | 04/01/2008 |
| 7336939 | Integrated tracking filters for direct conversion and low-IF single conversion broadband filters A radio frequency (RF) tuner includes a programmable tracking filter bank receiving an RF input and outputting a filtered RF signal. A mixer stage receives the filtered RF signal and outputs a first quadrature component of the filtered RF signal and a second quadrat... | 02/26/2008 |
| 7333790 | Method and apparatus for generating arbitrary phase shift using a phase shifter based on adding two perpendicular vectors with variable gains A radio frequency (RF) phase shifter having an RC-CR circuit that includes a first capacitor having a first capacitor node and a second capacitor node and a first resistor coupled between the first capacitor node and a ground. The RC-CR circuit also includes a secon... | 02/19/2008 |
| 7330089 | Balanced acoustic wave filter device In a balanced acoustic wave filter device, first and second acoustic wave filter sections that are connected in parallel to an unbalanced terminal are connected to first and second balanced terminals, respectively. The first and second surface acoustic wave filter s... | 02/12/2008 |
| 7305221 | Intermediate frequency circuit of television tuner A mixer for tuning to an intermediate frequency signal, an intermediate frequency amplifier provided at a rear stage of the mixer, an intermediate frequency tuning circuit interposed between the mixer and the intermediate frequency amplifier for tuning to the interm... | 12/04/2007 |
| 7289005 | Polar modulator and a method for modulation of a signal A polar modulator contains a phase locked loop which is designed to emit a radio-frequency signal at one frequency to one output, with the frequency being derived from the reference signal and from a phase modulation signal at a control input of the phase locked loo... | 10/30/2007 |
| 7263341 | Audio demodulating circuit and television broadcast receiver An audio demodulating circuit in accordance with the present invention for demodulating audio signals in a plurality of broadcast systems of mutually different frequency deviations such as the NTSC and the PAL, is arranged such that a connection between a trap circu... | 08/28/2007 |
| 7259800 | Television signal receiver with a universal output for surface-acoustic wave filters of different types The invention relates to a television signal receiver comprising a radio-frequency tuner (1) and at least one subsequent surface-acoustic wave filter (2), in which the radio-frequency tuner (1) filters a RF television signal applied to its input... | 08/21/2007 |
| 7228119 | Apparatus and method for a radio frequency (RF) receiver front end pre-selector tuning for improving the reduction in intermodulation distortion (IMD) A system and method of improving the rejection of intermodulation (IM) distortion in receivers (100) employing varactor tuning preselecters by exploiting the attenuating properties of a tunable preselecter at specific voltages. The invention takes advantage o... | 06/05/2007 |
| 7215932 | On-chip impedance matching power amplifier An on-chip impedance matching includes a transistor and a tank circuit. The transistor is operably coupled to receive an input signal. The tank circuit is operably coupled to the transistor, wherein a tap of the tank circuit provides an output of the on-chip impedan... | 05/08/2007 |
| 7187340 | Simultaneous multi-band ring focus reflector antenna-broadband feed Compact multi-band antenna system (500) includes a main reflector (502) having a shaped surface of revolution about a boresight axis of the antenna operable at a plurality of frequency bands spectrally offset from each other. A multi band feed system (... | 03/06/2007 |
| 7183880 | Discrete inductor bank and LC filter A discrete inductive-capacitive (LC) filter selects between at least two inductor banks to tune the LC filter. The filter receives an input signal that includes one or more bands of frequencies. A control signal selects a band of frequencies for processing. A first ... | 02/27/2007 |
| 7181184 | Band edge amplitude reduction system and method A band edge amplitude reduction system changes the filtering characteristics of a receiver based on the amplitude of signal(s) adjacent to an edge of the operating band of the receiver and/or of signals not under the power control of the receiver. For example, the r... | 02/20/2007 |
| 7170297 | Transmission response measurement system and method of using time gating A method and a measurement system determine a transmission response of a device under test (DUT). The method includes measuring a reflection response from a first port of the DUT while a known reflective termination is on a second port of the DUT, and time gating th... | 01/30/2007 |
| 7158774 | Method for tuning a filter The invention relates to a method for tuning a filter (5). The filter has at least one variable time constant, by which the location of the pass band (pc) of said at least one filter can be changed. In the method, at least one reference signal is inputted in ... | 01/02/2007 |
| 7116960 | Image-rejecting antenna apparatus An image-rejecting antenna apparatus includes an antenna unit for receiving or transmitting a wireless signal and an image-reject unit for removing an image component signal having a predetermined frequency from among signals received from the antenna unit. In an im... | 10/03/2006 |
| 7068127 | Tunable triple-mode mono-block filter assembly The present invention incorporates triple-mode, mono-block resonators that are tunable. Four novel and unobvious methods of tuning are disclosed. The first tuning method is to mechanically grind areas on three orthogonal faces of the mono-block in order to change th... | 06/27/2006 |
| 7015776 | Saw filter and communication device utilizing a weighted reflector A SAW filter includes at least two IDTs arranged along a SAW propagation direction on a piezoelectric substrate and first and second reflectors sandwiching the IDTs. A group of electrode fingers of each of the first and second reflectors is interdigital-width weight... | 03/21/2006 |
| 6915114 | Direct tuning of embedded integrated circuit components A method and apparatus for direct tuning of a component embedded within an integrated circuit includes processing that begins by providing a plurality of frequency dependent control input signals to an input of the integrated circuit. The processing continues for ea... | 07/05/2005 |
| 6898419 | Remotely adjustable bandpass filter Remotely controllable actuators are provided to alter the cavity size of bandpass cavity filters to alter the bandpass characteristics. In one embodiment, a stepper motor is used to provide lateral movement of a tuning plate to alter the size of the cavity. The neck... | 05/24/2005 |
| 6850752 | Single-to-differential conversion circuit outputting DC-balanced differential signal In a single-to-differential conversion circuit for converting a single signal into a differential signal formed of first and second signal components: a source-grounded (or emitter-grounded) first transistor receives the single signal at the drain (or collector); th... | 02/01/2005 |
| 6553216 | RF tunable filter arrangement with tunable image trap A tuner includes a tunable filter for selecting a desired RF signal in response to a tuning control signal and a tunable image trap for rejecting the undesired image signal corresponding to the desired RF signal responsive to the tuning control signal cou... | 04/22/2003 |
| 6476878 | Method and apparatus for audio signal processing The method, apparatus, and system for controlling audio anomalies by using a mute switch 51 to prevent output of an auxiliary audio signal 21 in a television signal 20 with an auxiliary audio signal 21, such as a NICAM audio signal or dual language audio ... | 11/05/2002 |
| 6472958 | Input circuit of satellite tuner A circuit that prevents a receiving signal from leaking to an LNB supply line to thereby deteriorate input VSWR characteristic includes a capacitor of about 1000 pF for removing noise and a capacitor of about 1 pF for passing a high frequency component wh... | 10/29/2002 |
| 6426780 | DTV receiver with low-band final I-F signal filtered for suppressing co-channel interfering NTSC audio carrier A digital television receiver converts very-high-frequency intermediate-frequency digital television signal to a band with uppermost frequency in the lower portion of the high-frequency range. This facilitates RLC analog filtering, such as a Butterworth-T... | 07/30/2002 |
| 6327464 | Frequency conversion circuit having a variable trap circuit tuned to the local oscillator frequency A frequency converting circuit which reduces the amount of leakage of oscillating signals to the output, includes a local oscillator; a mixer for mixing the input signal with the output of the local oscillator, and a variable trap circuit connected in the... | 12/04/2001 |
| 6178315 | FM radio receiver An FM radio receiver comprises a radio frequency tuning circuit for selecting a frequency modulated signal from an antenna and a local oscillator tuning circuit for tuning to an oscillating signal so as to convert the frequency modulated signal to an inte... | 01/23/2001 |
| 6072999 | Receiving apparatus A receiving apparatus is presented, in which a channel frequency can be selected over a wide band with an increased attenuation at an image frequency and/or at a local oscillation frequency by including a tunable filter having a following construction. Mi... | 06/06/2000 |
| 5907242 | Balanced passive bandpass filter and preamplifier for a receiver A balanced bandpass preamplifier assembly (23) is disclosed for use in a locator (10) for locating a beacon transmitter (18) housed within an underground boring device (12). The bandpass preamplifier assembly (23) includes a balanced bandpass filter (28) ... | 05/25/1999 |
| 5794134 | Receiving circuit for a portable telephone set An unnecessary wave suppressing means suppresses unnecessary waves included in a reception high frequency signal in a frequency band that is changed in accordance with a switching signal. The unnecessary wave suppressing means changes the pass band by ins... | 08/11/1998 |
| 5737698 | Antenna/amplifier and method for receiving orthogonally-polarized signals An antenna/amplifier includes a waveguide and an amplifier system. The amplifier and signal lines which terminate in orthogonal probes are carried on a common substrate. The orthogonal probes are spaced from a waveguide wall and isolated for good cross po... | 04/07/1998 |
| 5577270 | Receiver for eliminating a crosstalk of an adjacent broadcast A receiver has a tuner for converting a radio frequency (RF) signal of a television broadcast supplied thereto into an intermediate frequency (IF) signal, an IF circuit for amplifying the IF signal to obtain an amplified IF signal with a required band wid... | 11/19/1996 |
| 5231408 | Glass antenna amplifier A compensating/amplifying device for a window glass antenna for an automobile. The device utilizes heating wires, which remove fog formed on the automobile window glass, as an antenna and includes band-pass filter coils interposed between a battery of the... | 07/27/1993 |
| 5126848 | Circuit for preventing the interference of TV channel 6 broadcast A circuit prevents the interference of FM radio broadcasting with TV channel 6 broadcast. The circuit comprises a microprocessor for receiving channel selecting data output from a data input device and outputting phase locked loop (PLL) data. A control si... | 06/30/1992 |
