Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 8086210 | Flow based layer 2 handover mechanism for mobile node with multi network interfaces A method for handing-off a mobile node (MN) from one network interface to another network interface, the network interfaces being connected to a same level 2 (L2) network. The method includes detecting at least two network interface cards (NICs) of the MN that are c... | 12/27/2011 |
| 7376403 | Terahertz radiation mixer A terahertz radiation mixer comprises a heterodyned field-effect transistor (FET) having a high electron mobility heterostructure that provides a gatable two-dimensional electron gas in the channel region of the FET. The mixer can operate in either a broadband pinch... | 05/20/2008 |
| 7324796 | Low temperature co-fired ceramic sub-harmonic mixer A sub harmonic mixer has improved electrical performance in a small package size. The mixer has a low temperature co-fired ceramic substrate. Coupled lines are located within the substrate and connected to an LO port, an RF port and an intermediate frequency port. T... | 01/29/2008 |
| 7323970 | Method and system for remote interaction with a vehicle via wireless communication A telemetry system coupled to a vehicle can communicate with a remote site using the overhead control channels of a wireless network, such as a cellular mobile radiotelephone network. The telemetry system can monitor or control aspects of the vehicle's operations ba... | 01/29/2008 |
| 7167698 | Balanced sub-harmonic mixer A wide band mixer is provided that mitigates local oscillator leakage. A LO signal is provided to a 180 degree splitter that provides a first intermediate LO signal and a second intermediate LO signal 180° out of phase from one another. Since both the first and sec... | 01/23/2007 |
| 7154870 | Method of handoff control in an enterprise code division multiple access wireless system A wireless office communication system including a wireless internet base station (WIBS) encompassing a base station controller (BSC), a mobile switch controller (MSC), and an ethernet interface module for coupling the wireless internet base station (WIBS) to an exi... | 12/26/2006 |
| 7065061 | System and method for providing data services using idle cell resources Providing data services using idle cell capacity in a cellular communications system. The system and method assign priorities to each remote user device in the cellular communications system. In response to a request for service for a remote user device, the mobile ... | 06/20/2006 |
| 6317590 | Mixer for a receiver A sub-harmonically pumped mixer has an anti-parallel diode pair switchable at twice the local oscillator frequency. Preferably, there are provided dual anti-parallel diode pairs. The local oscillator is coupled to the diode pairs by means of an unbalanced... | 11/13/2001 |
| 6205324 | Broadband double-balanced frequency mixer The invention provides a broadband double-balanced mixer capable of operating across a range of frequencies from millimeter to microwave. The mixer includes a Wilkinson type splitter.... | 03/20/2001 |
| 6192229 | Diode mixer circuit In a diode mixer circuit MIX, a driving circuit DRIV produces a first, second, third and fourth drive signal DS1, DS2, DS3, DS4. Each drive signal is a combination of a first and a second input signal LO, RF with the following signs: DS1: +LO+RF DS2: +LO-... | 02/20/2001 |
| 5974307 | Method and system communicating with a voice response unit over a cellular telephone network This invention overcomes the disadvantages of the prior art by providing a voice response unit that communicates rapidly and directly with a metered cellular telephone network with minimum human intervention. The rapid communication is achieved by knowing... | 10/26/1999 |
| 5729197 | Automatic, self-triggering alarm processing system and method Various embodiments of an automatic alarm and communications processing system/method are presented. The alarm processing system/method monitors at least one sensor unit which is designed to provide an alarm signal upon occurrence of a corresponding prede... | 03/17/1998 |
| 5600705 | Method for call establishment The invention relates to methods for call establishment in a cellular radio system. In the inventive method, the visitor location register stores information (405) on whether the subscriber (CPP) is located within the service area of its home private bran... | 02/04/1997 |
| 5301223 | Cellular telephone system with remote programming, voice responsive registration and real time billing Method and apparatus for use in a mobile telephone rental system in which credit card information is communicated between the mobile telephone unit 100 and a Voice Response System 302 for customer registration and remote programming of mobile telephone un... | 04/05/1994 |
| 4878029 | Complex digital sampling converter for demodulator A complex digital sampling converter, for use with an IF demodulator, includes: an analog-to-digital converter (ADC) receiving the IF analog signal for conversion to a digital data stream by sampling at a sampling rate frequency substantially equal to fou... | 10/31/1989 |
| 4658440 | Single balanced self-oscillating dual gate FET mixer A single balanced self-oscillating dual gate FET mixer includes two dual-gate FETs, a dielectric resonator, two transmission lines inductively coupled to the resonator and connected to the second gates of the two dual-gate FETs, an RF input, two RF matchi... | 04/14/1987 |
| 4637070 | UHF mixing circuit having π configured impedance converter In a UHF tuner having a diode mixer and a double-tuned circuit; a UHF tuner of good tuning characteristics comprising the fact that a π-type impedance converter portion consisting of capacitors is disposed in a coupling part between the diode mixer and t... | 01/13/1987 |
| 4340975 | Microwave mixing circuit and a VHF-UHF tuner having the mixing circuit In a double superheterodyne tuner for receiving TV channel signals, a frequency in a range defined between 2520 and 2700 MHz is selected as the first intermediate frequency, while the first intermediate frequency is obtained by subtracting a desired chann... | 07/20/1982 |
| 4317231 | Microwave circuit for a parametric upper sideband down converter In a microwave circuit for a parametric upper sideband down converter with real image frequency termination conductance, including a pump circuit supplying a pump signal, a parallel circuit at its input, an intermediate frequency circuit at its output, an... | 02/23/1982 |
| 4287603 | Radiated input mixer A radiated input mixer for converting a radio frequency (RF) signal into an intermediate frequency (IF) signal with the aid of a local oscillator (LO) signal includes, in combination, an antenna having balanced feed terminals, a diode quad, and a balun wi... | 09/01/1981 |
| 4270224 | Microwave down converter The converter consists of a waveguide through which passes at right-angles a dielectric wafer for a microstrip. On each side of the waveguide this strip forms a microstrip line section. In the waveguide two chip diodes in series connecting the middles of ... | 05/26/1981 |
| 4249263 | Mixer circuit A mixer circuit formed of a micro strip line for converting an input signal in SHF band into an intermediate frequency signal in UHF band is disclosed which includes an arch-shaped half-wavelength line having a length equal to one half of the wavelength o... | 02/03/1981 |
| 4245355 | Microwave frequency converter A frequency converter, incorporating a subharmonic mixer and a YIG tuned local oscillator filter in an integrated circuit configuration, provides improved conversion efficiency and ease of fabrication.... | 01/13/1981 |
| 4224572 | Broadband doubly balanced mixer having improved termination insensitivity characteristics A diode modulator type electrical mixer network has at least two hybrids of transmission line construction, interconnected by means of two sets of four or more diodes arranged in bridge circuit configurations. The interconnecting configuration provides a ... | 09/23/1980 |
| 4204168 | Signal converter using a quad diode race A signal converter, and more particularly, a mixer includes a quad diode race or bridge having a first signal supplied to a first pair of input ports in a balanced state, and a second signal supplied to another pair of input ports in an unbalanced state. ... | 05/20/1980 |
| 4163944 | Compensation circuit for an electrical signal mixer The carrier suppression circuit of the present invention is utilized to minimize electrical imbalances within double-balanced mixers. The circuit operates upon a modulating signal, having at least two states so as to adjust the dwell time that the signal ... | 08/07/1979 |
| 4163232 | Dual mode microwave mixer A four-port dual mode microwave mixer which operates without IF or RF switches and which provides both a passive mode of operation wherein the mixer operates as a lossy frequency translator when driven by a offset signal generator, and an active mode of o... | 07/31/1979 |
| 4158817 | Microwave input circuit with parametric down converter A microwave input circuit including a parametric upper sideband down converter for receiving an input signal whose frequency is not much different from the intermediate frequency produced at the output of the down converter. The down converter may be eith... | 06/19/1979 |
| 4152653 | Integrated mixer arrangement A single balanced mixer for use with a superheterodyne receiver or the like comprises an integrated structure characterized by a pair of opposed capacitive plates, a first mixing diode connected between the plates and a second mixing diode connected betwe... | 05/01/1979 |
| 4119914 | Double balanced mixer using single ferrite core Disclosed is a double balanced mixer using a novel single ferrite core construction. The core includes two apertures and a transformer is wound through each aperture. The two transformers are connected by diodes in the known manner to provide the mixer. T... | 10/10/1978 |
| 4112374 | Doubly balanced mixer with optimized dynamic range A circuit for mixing first and second rf signals to produce an output signal containing a beat frequency comprises a pair of switches each of which has a four diode bridge controlled by the first rf signal. The first rf signal is coupled to a balanced cur... | 09/05/1978 |
| 4104594 | Modified A. M. detector Reduction of interference from off-frequency signals in an a.m. receiver is achieved by substituting an average detector for the conventional peak detector employed in such receivers. Conversely, enhancement of off-frequency signal reception is achieved b... | 08/01/1978 |
| 4099126 | Frequency converter apparatus A dual balanced mixer frequency converter is disclosed which provides a low conversion loss by reactively terminating one of the leads on a combiner circuit such that all the image frequency signal power and/or part of the reflected receiver power is retu... | 07/04/1978 |
| 4079321 | Dual diode high conversion efficiency signal mixer A signal mixer utilizing two oppositely poled diodes, coupled to provide parallel operation at high frequencies and series operation at intermediate and low frequencies. This arrangement reduces the number of signals generated by the mixing process with a... | 03/14/1978 |
| 4063176 | Broadband high frequency mixer A broadband mixer has two separate tapered ground plane microstrip baluns associated with a first signal port and two separate tapered ground plane microstrip baluns associated with a second signal port together with a frequency converter or mixer portion... | 12/13/1977 |
| 4052785 | Method of making a transformer assembly Disclosed is a double balanced mixer using a novel single ferrite core construction. The core includes two apertures and a transformer is wound through each aperture. The two transformers are connected by diodes in the known manner to provide the mixer. T... | 10/11/1977 |
| 4035732 | High dynamic range receiver front end mixer requiring low local oscillator injection power An improved circuit utilized in an RF tuner or receiver for selecting and nverting an RF signal to an intermediate frequency with reduced injection power requirements.The circuit is utilized in the "front end" of a radio frequency receiver or tuning secti... | 07/12/1977 |
| 4032850 | Coaxial balun with doubly balanced heterodyne converter A coaxial line has a conductive surrounding shield connected from a first to a second point thereon. The outer conductor of the coaxial line shield is discontinuous at an intermediate point inside the shield so that it has two intermediate ends or termina... | 06/28/1977 |
| 4006425 | Dielectric image guide integrated mixer/detector circuit Disclosed is a dielectric image guide integrated circuit including first and second sections of image guide of preselected cross-sectional areas joined by an image guide transition section of variable cross-sectional area and all mounted on the surface of... | 02/01/1977 |
| 3992674 | Balanced dual output mixer circuit An improved balanced dual output diode mixer circuit having separate output terminals for audio and RF output signals is disclosed. The mixer circuit includes a first transformer having a primary and a center tapped secondary winding. The ends of the seco... | 11/16/1976 |
