Celebrity Inventors
Mark Twain (Samuel L. Clemens) received Patent No. 121,992 for "An Improvement in Adjustable and Detachable Straps for Garments." He later received two more patents: one for a self-pasting scrapbook and one for a game to help players remember important historical dates.
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| Number | Title | Issue Date |
| 4612668 | FM wireless transmitter A FM wireless headphone transmitter which uses a novel technique of varying the transmitted frequency. Instead of the traditional methods of using a variably meshing multi-plate capacitor, the invention uses a printed circuit inductance with a tuning plat... | 09/16/1986 |
| 4612669 | Antenna matching system A system for adjusting the antenna matching network of a radio system in the presence of an interfering signal in the matching network being adjusted comprises a loop from which the interfering signal is cancelled by an adaptive interference cancellation ... | 09/16/1986 |
| 4602227 | Coaxial LC phase-shifter for phase-controlled television broadcast switching circuit A television broadcast transmitter includes two power amplifiers or transmitters, a dummy load and an antenna. A noncontacting switching arrangement includes directional couplers or hybrids operated as controllable phase-shifters under the control of pair... | 07/22/1986 |
| 4599744 | UHF broadcast antenna on a tower with circular waveguide carrying RF energy up the tower to the antenna with polarization adjustments and exclusions In an ultra high frequency (UHF), high power broadcast television (TV) antenna system that includes a radiating antenna located at the top of a tower structure many hundreds of feet high, a transmitter at the bottom of the tower and a circular waveguide t... | 07/08/1986 |
| 4593409 | Transceiver protection arrangement A warning and protection circuit arrangement suitable for use in conjunction with a two-way portable transceiver having a removable battery pack/antenna includes a battery enclosure containing an antenna structure. A circuit is enclosed inside the battery... | 06/03/1986 |
| 4593412 | Integrated oscillator antenna for low power, low harmonic radiation A low-power transmitter for garage door operator systems and the like wherein harmonics of the fundamental frequency are suppressed by class A or AB oscillator operation and fundamental radiation is enhanced by way of a combined inductor/radiator having c... | 06/03/1986 |
| 4549310 | Cross-polarization corrector for circular waveguide A UHF broadcast antenna system uses circular waveguide for the run from the high-power final amplifier to the antenna. Undesired cross-polarization components are formed in the circular waveguide due to unavoidable tolerances. Correction of the cross-pola... | 10/22/1985 |
| 4541119 | Portable broadcast band information transmitting system A portable advertising sign is positioned in proximity to a street and includes a message board. A low power transmitter is physically secured to the sign and generates a modulated RF output signal at a predetermined frequency within the broadcast band. A... | 09/10/1985 |
| 4521913 | Multifrequency antenna matching apparatus with antomatic tuning An antenna matching apparatus tunable to different frequencies is disclosed for use with a high frequency transmitter that is rapidly switchable between different transmitting frequencies by a control unit according to a predetermined frequency scheme. Th... | 06/04/1985 |
| 4493112 | Antenna tuner discriminator A simple technique and circuit is disclosed to replace prior Z-θ type discriminators in supplying the loading and phasing control signals to the impedance matching network in an automatic antenna tuner. The new circuit samples forward and reflected volta... | 01/08/1985 |
| 4476578 | Device for detecting the optimum anode load impedance of a tube transmitter in a high frequency transmission chain A device for detecting the optimum anode load impedence of a transmitter tube in a high frequency transmission chain. A phase shift circuit phase shifts by kπ/2 (with k being a positive or negative uneven integer) the phase difference between the input a... | 10/09/1984 |
| 4476576 | VLF Communication system A VLF communication system which utilizes the electrically conducting portions of an electromechanical cable connected to a deployed aerostat and acting as its tether so as to additionally serve as the VLF antenna.... | 10/09/1984 |
| 4471493 | Wireless telephone extension unit with self-contained dipole antenna A remote unit for use in a wireless extension telephone system having a self-contained dipole antenna. Utilizing the unique construction of the telephone instrument housing one element of the dipole is included in a planar element that functions normally ... | 09/11/1984 |
| 4459595 | Condition responsive RF transmitting device A device mounted on a power transmission device of a vehicle is utilized for transmitting an RF signal when a predetermined parameter exists in the power transmission device wherein the RF signal is capable of being received at a remote location. An elect... | 07/10/1984 |
| 4453269 | Apparatus for improving the frequency stability of a transmitter oscillator circuit A novel apparatus and method for improving the stability of an electrical circuit such as an oscillator and/or a radio frequency transmitter which is coupled to a radiating element wherein the radiating element such as a loop is coupled to the inductor or... | 06/05/1984 |
| 4451832 | Radio frequency transmitter coupling circuit An efficient circuit for coupling at least two radio frequency transmitters of arbitrary power and frequency to one antenna comprises a three-port ferrite circulator connected to the output of each transmitter, a tee connector with a predetermined impedan... | 05/29/1984 |
| 4449128 | Radio frequency transmitter coupling circuit An efficient circuit for coupling at least three radio frequency transmitters of arbitrary power and frequency to one antenna comprises a three-port circulator connected to the output of each transmitter, a four-port connector and a five-port inphase powe... | 05/15/1984 |
| 4445123 | Method for establishing a vertical E-field antenna installation A method of establishing an ELF/VLF, vertical E-field transmitter loop antenna installation. The method comprises the steps of ascertaining a land region having contiguous areas of widely differing (by at least 4 to 1) subsurface conductivity, and positio... | 04/24/1984 |
| 4370694 | Electrical interlock A radio transmitter is protected against the possibility of initiating transmission without the radio being connected to a load by having a switch that controls a push-to-talk key line that is only enabled when the antenna load is connected to the transmi... | 01/25/1983 |
| 4327444 | Miniature transmitter and method for making same There is disclosed a miniature hand-held radio-frequency transmitter. An operating frequency is determined by a lumped-circuit oscillator which feeds an antenna etched on the periphery of the circuit board. The antenna is tuned to a frequency which is sli... | 04/27/1982 |
| 4229826 | Wide band impedance matching device A wide band impedance matching device is described for matching the impedance of an antenna transmission line to a radio transceiver over a wide band of radio frequencies. The device includes an impedance matching network having an inductor and two capaci... | 10/21/1980 |
| 4209758 | Method and apparatus for the automatic matching of a transmitter to an antenna A method and apparatus for the automatic matching of a transmitter to an antenna is disclosed. A voltage signal proportional to the square root of the load impedance of the final stage of the transmitter is compared to a signal which is proportional to th... | 06/24/1980 |
| 4201956 | Arrangement for the generation and radiation of microwaves Apparatus for the generation and radiation of microwave radiation including a microwave oscillator having a cavity resonator directly coupled with the input of a horn resonator by way of a first apertured diaphragm. There is arranged within the horn radia... | 05/06/1980 |
| 4181889 | Citizens band transmitter with overall envelope feedback from antenna coupling filter A citizens band transmitter employing negative overall envelope feedback in the final RF stage obtains the feedback signal from a filter in the antenna coupling network which has a phase shift of 90 degrees or an odd multiple thereof at the radio frequenc... | 01/01/1980 |
| 4173743 | Coupling a frequency modulated signal to a tuned load A transmitter provides a frequency modulated voltage and a sawtooth voltage. The sawtooth voltage has an amplitude proportional to the frequency of the modulated voltage. The modulated voltage is coupled to an antenna via a varactor that is biased by the ... | 11/06/1979 |
| 4145658 | Method and apparatus for cancelling interference between area coverage and spot coverage antenna beams The present invention relates to method and apparatus for substantially cancelling interference between signals using the same frequency spectrum which are received via overlapping area coverage and spot coverage antenna beams. At the transmitter where th... | 03/20/1979 |
| 4134118 | Aircraft antenna-switching arrangements A control system for an aircraft radio-navigation installation having forward-looking and rearward-looking antennas. The system provides the usual diversity reception facilities of "hunting" and then locking on to one antenna when an acceptable signal is ... | 01/09/1979 |
| 4106025 | Coupling converter for vehicle antennas A coupling converter for use of a broadcast-receiving antenna both with its broadcast receiver and with a citizens band transceiver, including impedance matching means and a priority switch to protect the transceiver from overload by transmission without ... | 08/08/1978 |
| 4086535 | Microwave oscillator The present invention relates to a microwave oscillator to be applied to radiosonde. The microwave oscillator in accordance with the present invention is constructed on a plane base plate of dielectric material (insulation material) on whose both sides co... | 04/25/1978 |
| 4081750 | Antenna coupler with automatically switched dummy load An antenna coupling adapter device is disclosed of a type designed to connect an antenna to the output antenna jack of portable radio transmitter-receivers such as Citizens Band units. The adapter is comprised of a first coupling mating with the antenna o... | 03/28/1978 |
| 4053835 | Apparatus for transmitting high frequency signals In accordance with the teachings of the present invention apparatus for permitting interference free transmission of high frequency signals in any given frequency range is provided. In the inventive apparatus, a central conductor of a coaxially disposed p... | 10/11/1977 |
| 4053897 | Microwave element including source antenna and cavity portions A microwave element is disclosed that is fabricated from a dielectric material wherein the antenna, the iris, and a microwave cavity portion are formed generally from a single piece of relatively high dielectric constant material. The microwave cavity por... | 10/11/1977 |
| 4038602 | Automodulated realtivistic electron beam microwave source A relativistic electron beam device for producing highpower microwave radion. The device comprises an electron beam injection gun, a drift chamber comprising a tube having a plurality of gapped resonant cavities along its length, means for converting the... | 07/26/1977 |
| 4006418 | Quaternary phase-shift keying with time delayed channel A digital data communication system employing quaternary phase-shift keying for transmission by a microwave radio link. The digital modulation of the quadrature channel is delayed from the in-phase channel by one-half the time duration of a bit so that th... | 02/01/1977 |
| 4004228 | Portable transmitter A portable transmitter intended to be used to broadcast a signal in response to an external actuation can be constructed so as to include a board such as a so-called printed circuit board carrying a metal coil serving as an antenna. This coil surrounds a ... | 01/18/1977 |
| 3967217 | Modulator for digital microwave transmitter A microwave modulator especially adapted for use in a digital microwave transmitter and capable of operation over a broad range of data rates and carrier frequencies. The modulator is operative with a multiple level modulation signal having zero average a... | 06/29/1976 |
| 3959746 | Automatic antenna coupler tuning control circuit A control circuit is disclosed to automatically tune an antenna coupler to provide an output signal having a selected one of different operating frequencies. The antenna coupler includes a frequency band selecting switch and a plurality of tuning elements... | 05/25/1976 |
