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"That the automobile has practically reached the limit of its development is suggested by the fact that during the past year no improvements of a radical nature have been introduced."
Scientific American ; Jan. 2 edition, 1909
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| Number | Title | Issue Date |
| 5180999 | Filter system with controlled amplitude in stopband or passband A filter system which may be configured either as a stopband (notch) or passband filter having controlled gain and low ripple throughout its stopband or passband. The system includes a filter network which is operative for splitting an input signal spectr... | 01/19/1993 |
| 5179730 | Selectivity system for a direct conversion receiver A direct conversion receiver having a tri-phase architecture including three separate baseband signal channels. RF communications signals which are being tuned by the receiver are split into three equal and in-phase components which are mixed with three e... | 01/12/1993 |
| 5173791 | Liquid crystal display pixel with a capacitive compensating transistor for driving transistor An active matrix thin film transistor liquid crystal display having two thin film transistors for use in driving each of the liquid crystal pixels making up the matrix of the display. The first thin film transistor associated with each pixel is used in dr... | 12/22/1992 |
| 5155724 | Dual mode diplexer/multiplexer A broadband diplexer for use in dividing input signals in accordance with frequency and in constructing multiplexers including multiple diplexers. The diplexer includes a pair of 0-degree couplers one of which is configured as a signal splitter while the ... | 10/13/1992 |
| 5143452 | System for interfacing a single sensor unit with multiple data processing modules A fault-tolerant system for interfacing a single sensor unit to multiple display/control modules. The system includes a fixed resistor connected in series with the sensor unit and multiple data centralization units each including a source for providing a ... | 09/01/1992 |
| 5130678 | Transmission line transformer with DC isolation A transmission line transformer (20, 30, 31) with inherent DC isolation has two sets (22, 22') of transmission line elements (ZN) with characteristic impedances which vary from relatively high values near the transformer inputs (P1, P2) to relatively low ... | 07/14/1992 |
| 5121072 | Digital demodulator for amplitude or angle modulation using truncated nonlinear power series approximations A digital demodulator for demodulating baseband signals in a radio receiver. The demodulator includes a digital signal processing module for forming a mathematical series adapted for generating demodulation functions. The selection of coefficients for thi... | 06/09/1992 |
| 5115203 | Digital power amplifier A wideband high efficiency amplification system for amplifying radio frequency signals to high power levels. The system includes components adapted for generating an RF carrier signal having a multi-level waveform which may be characterized as a "modified... | 05/19/1992 |
| 5095536 | Direct conversion receiver with tri-phase architecture A direct conversion receiver having a tri-phase architecture including three separate baseband signal channels. RF communications signals which are being tuned by the receiver are split into three equal and in-phase components which are mixed with three e... | 03/10/1992 |
| 5065164 | Frequency range enchanced monopole antenna A monopole antenna adapted for efficiently radiating energy over an enhanced range of frequencies. The antenna includes a vertically inclined wire approaching one-quarter wavelength of said range of frequencies and a number of small-sized inductors instal... | 11/12/1991 |
| 5060299 | Radio frequency mixer circuit utilizing interface transformers and switching diodes A diode mixer characterized by low levels of intermodulation distortion. The mixer circuit includes a center-tapped input transformer for coupling the circuit to local oscillator and radio frequency signal sources and a center-tapped output transformer fo... | 10/22/1991 |
| 5039959 | Phase switching circuit A phase switching circuit adapted for high frequency applications which is operative for shifting the phase of an input signal either by 0° or 180° in response to a control signal. The switching circuit includes two FETs which are coupled together so as... | 08/13/1991 |
| 5034568 | Package structure for multichip modules A package for enclosing and mounting a multichip module in which separate mechanisms are provided for mechanically attaching the package to a circuit board and for electrically connecting the package to the circuit board to which it is attached. The packa... | 07/23/1991 |
| 5021792 | System for determining direction or attitude using GPS satellite signals A system for determining spatial orientation based on the carrier phase of signals received from a set of GPS satellites. The system comprises an antenna array including a number of antennas coupled to GPS radio receivers, a mechanism for reconfiguring th... | 06/04/1991 |
| 5010506 | Spurious level reduction and control method for direct digital synthesizers A direct digital synthesizer that outputs at least a predetermined output frequency related signal from a received digital signal, K, with minimum spurious signal levels. A storage device stores an initial phase value of the digital signal, K, and provide... | 04/23/1991 |
| 5006812 | Power amplifier with built-in test circuit A test circuit for use in testing amplifiers in order to check that they are functioning properly at operational power levels. The test circuit includes switching mechanisms which configure the amplifier in feedback mode in order to cause the amplifier to... | 04/09/1991 |
| 4970479 | Multicoupler including frequency shift filters A multicoupler for use in interfacing multiple frequency-agile transceivers to a single antenna. The multicoupler includes a set of high-Q filters and a switching matrix for selectively connecting the transceivers to the filters. The filters have frequenc... | 11/13/1990 |
