Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 4153884 | Frequency synthesizer for transmitter/receiver using a phase locked loop A frequency synthesizer for use in a transmitter/receiver, comprising a voltage controlled oscillator, a programmable frequency divider for dividing the frequency of the output from the voltage controlled oscillator, a reference oscillator, a reference co... | 05/08/1979 |
| 4145656 | Transceiver capable of sensing a clear channel A transceiver receives electronic input signals comprised of a plurality of frequency bands lying within a plurality of non-overlapping frequency channels. A mixer frequency shifts a selected band to a predetermined center frequency in response to a first... | 03/20/1979 |
| 4145655 | Digitally transmitting transceiver A transceiver has digital transmitting capability. The transceiver includes an antenna having an input for transmitting signals applied thereto. Signal generating means generate first and second signals having first and second frequencies, and transmissio... | 03/20/1979 |
| 4132950 | Clarifying radio receiver A clarifying radio receiver has a charge transfer device filter which is coupled to receive input signals consisting of a plurality of frequency bands lying respectively within a plurality of non-overlapping frequency channels. The filter simultaneously r... | 01/02/1979 |
| 4097805 | Frequency-synthesizer type transceiver This invention provides a frequency-synthesizer type transceiver having a voltage-controlled oscillator and means for comparing the phases of mixed frequency, whereby the voltage-controlled oscillator is regulated by signals resulting from the phase compa... | 06/27/1978 |
| 4095183 | Tuning circuit A tuning circuit suitable for use in a transmitter-receiver of the phase locked loop frequency synthesizing type which has two separate variable-capacity elements, one for the follow-up control of the phase locked loop and the other for shift and modulati... | 06/13/1978 |
| 4092594 | Crystalless scanning radio receiver controlled by processing means An FM receiver and transmitter apparatus is disclosed which is of the superheterodyne type and is capable of scanning and receiving a plurality of channels on a plurality of frequency bands as well as transmitting on a plurality of channels. The receiver ... | 05/30/1978 |
| 4090036 | Satellite communications system A satellite communications system provides automatic channel assignment without employing a dedicated signalling channel. A major station detects carrier-free forward channels and transmits on each a forward signal. A minor station hunts all available for... | 05/16/1978 |
| 4086545 | Phase locked loop type transmitter receiver A phase locked loop type transmitter-receiver having a phase locked loop type synthesizer including a circuit in which a programmable counter, a phase discriminator, a low-pass filter, a voltage-controlled oscillator and a mixer are connected in a closed ... | 04/25/1978 |
| 4070626 | Radio telephone with channel switch In a radio telephone device including a channel selector containing at least one frequency divider having a plurality of control inputs each associated with a respective frequency dividing ratio and each arranged to receive an electrical signal for influe... | 01/24/1978 |
| 4063173 | Dual mode receiver A transponder including a receiver and a transmitter controlled by the output of the receiver, with the receiver including a first phase locked loop with a mixer and a voltage controlled oscillator supplying an output to a second phase locked loop includi... | 12/13/1977 |
| 4061973 | Synthesizer The synthesizer uses phase lock loop techniques to generate either the carrier signal for an associated transmitter or the injection signal for an associated receiver. A programmable divider controls the specific channel to which the synthesizer tunes the... | 12/06/1977 |
| 4035727 | Multichannel radio transmitter with means to prevent abnormal wave radiation A multichannel transmitter incorporating a phase-locked loop frequency synthesizer to generate a carrier signal of a selected radio frequency, which carrier is subsequently amplified, modulated, and radiated into space. In order to prevent abnormal radiat... | 07/12/1977 |
| 4027242 | Double superheterodyne multichannel receiver with a phase-locked loop frequency synthesizer A double superheterodyne receiver having a single local oscillator which supplies a signal of a predetermined frequency to a second frequency converter or mixer, where a second intermediate frequency signal is produced for final detection. The local oscil... | 05/31/1977 |
| 4013957 | Channel-selecting apparatus for a multichannel transceiver A channel-selecting apparatus for a multichannel transceiver designed to select, upon channel selection, a transmission-reception signal frequency specified for a given channel from among those of all the channels utilizing a phase locked loop system. The... | 03/22/1977 |
| 4002995 | Digital frequency synthesizer having selectable frequency offset between transmit and receive frequencies A digital frequency synthesizer includes a phase locked loop having dual presetting means for enabling the loop to generate a first frequency signal (e.g., "transmit" signal) for each of many selectable channels and generate a second frequency signal (e.g... | 01/11/1977 |
| 3983484 | Multichannel signal transmitting and receiving apparatus A multichannel signal transmitting and receiving apparatus comprises a single reference local oscillator, a phase locked loop including a phase comparator receiving as one input a signal resulting from a frequency division of the output of the local oscil... | 09/28/1976 |
| 3949296 | Code and generating means for avionics communciations synthesizer For use in a channel synthesizer utilizing a pulse swallowing phase locked loop, an eight bit code represents the megahertz component of the selected channel. An eight stage shift register is preloaded with the coded version of the selected megahertz comp... | 04/06/1976 |
| 3944925 | Phase-locked loop transceiver having automatic frequency offset selectability This specification discloses a frequency synthesizer or phase-locked loop transceiver operating from a reference oscillator source, FREF. A single phase-locked loop system for the transceiver includes counter means located in a feedback path co... | 03/16/1976 |
