Bizarre Patents
Mouthguard made at least partially from an edible candy
A mouthguard includes a U-shaped upper bite plate which removably fits over upper teeth of a person, with the entire upper bite plate being made from a soft, deformable and edible gummi candy.
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| Number | Title | Issue Date |
| 4606048 | Radio communication system A radio communication system includes a transmitter unit, a radio transmission line and a receiver unit. The transmitter unit contains an insertion circuit for inserting one or two signals for carrier recovery into a modulated wave signal. Each signal for... | 08/12/1986 |
| 4584708 | Communication system, and transmitter therefor, including special announcement recognition FM transmission system in which, besides program content, an auxiliary carrier of, for example 57 kHz, is radiated, which auxiliary carrier is modulated by an announcement recognition (AR) signal and by a region or radio-station recognition (RR) signal, t... | 04/22/1986 |
| 4534054 | Signaling system for FM transmission systems A signaling system for FM transmission systems is disclosed that utilizes one or more so-called quadrature subcarriers for transmitting at least one data signal, including signaling tones, digital data, program material, or the like. The signal is modulat... | 08/06/1985 |
| 4523328 | FM-receiver including a frequency-locked loop FM-receiver including a frequency-locked loop (2-14), which loop includes, successively connected, a voltage controlled oscillator (8), a mixer circuit (2) connected to an aerial input, an IF-portion comprising an IF-filter (9), an FM-detector (4), a loop... | 06/11/1985 |
| 4516257 | Triphonic sound system A triphonic sound system in which three independent stereophonically related audio frequency source signals L, R and C are combined to derive three other audio frequency signals M, S, and T which respectively comprise (L+1.4C+R, (L-R) and (-1.4C). In a pr... | 05/07/1985 |
| 4506376 | Subcarrier signal generator for use in stereo tuners First and second rectangular signals which are 90° out of phase with each other are derived by comparators and an RS flip-flop from a symmetrical triangular wave signal. The first rectangular signal is halved in frequency by a frequency divider, the outp... | 03/19/1985 |
| 4502148 | FM Stereo demodulator for demodulating stereo signals directly from an FM intermediate frequency signal Disclosed is an FM stereo demodulator in which components of the demodulated signal corresponding to odd harmonics of the subcarrier signal are eliminated. In order to prevent the production of odd harmonics, the multiplication between positive and negati... | 02/26/1985 |
| 4497063 | FM stereo demodulator An FM stereo demodulator having improved separation and distortion characteristics comprising a high-frequency pulse signal which is modulated by a sinusoidal subcarrier signal produced in accordance with a stereo pilot signal. The high-frequency pulse si... | 01/29/1985 |
| 4493099 | FM Broadcasting system with transmitter identification An FM broadcasting system comprises an FM transmitter for transmitting a multiplex signal which is frequency-modulated on a main carrier wave and an FM receiver for cooperation with said FM transmitter. The multiplex signal comprises: an audio-frequency f... | 01/08/1985 |
| 4485483 | FM Stereophonic system incorporating companding of difference signal An FM stereophonic radio broadcasting system in which stereophonically related audio frequency source signals L and R are matrixed to obtain stereophonic sum and difference signals M and S, respectively. At the transmitter, the difference signal, is compr... | 11/27/1984 |
| 4457011 | FM Broadcast band demodulator/stereo decoder An FM broadcast band demodulator and stereo decoder which can be connected to an existing frequency modulated, or FM broadcast tuner or receiver. The unit includes four basic sections; FM demodulation, stereo decoding, audio amplification, and tuning erro... | 06/26/1984 |
| 4417349 | SCA Data transmission system with a raised cosine filter A system and method for transferring digital data via the sub-carrier of a commercial broadcast FM radio station. Digital data generated by an originating subscriber is shaped with substantially a raised cosine response in the time domain. The shaped sign... | 11/22/1983 |
| 4398060 | Muting circuit for an FM radio receiver Signal transmitting operation is effected in a muting circuit when a first constant current source connected to the emitters of first and second transistors is operative with a second constant current source connected to the emitters of third and fourth t... | 08/09/1983 |
| 4393273 | FM-Receiver with transmitter characterization An FM-receiver with transmitter characterization, having a tuning unit, an IF-amplifier, a demodulation circuit for demodulating a discrete transmitter characterization signal, a clock regeneration circuit, a decoding device for decoding the discrete tran... | 07/12/1983 |
| 4392019 | Surround sound system A system for surround sound utilizes three audio channels two of which are either in phase of 180° out of phase for all angles of elevation and azimuth of the incident sound and which can be decoded to give good quality stereo reception. The third channe... | 07/05/1983 |
| 4388493 | In-band signaling system for FM transmission systems An in-band signaling system for injecting at least one low frequency audio tone into an audio stereo signal includes a tone generator circuit and a circuit for generation of first and second component signals for each tone, each component signal being of ... | 06/14/1983 |
| 4301331 | Composite limiting sum and difference circuitry for extending the reception area of a frequency modulated stereo radio transmitter A frequency modulated stereo transmitter in the preferred embodiment has a stereo generator which receives audio sterero signals directly. The stereo generator includes gain control circuitry which acts directly on the sum and difference signals generated... | 11/17/1981 |
| 4300020 | Method and apparatus for eliminating pilot signal components from stereo demodulated signals A pilot signal cancelling signal is first combined with a composite stereo signal by a first predetermined ratio and thus a combined signal is fed to a stereo demodulator (3A) which produces a difference signal and an inverted difference signal, while the... | 11/10/1981 |
| 4293736 | Noise eliminator for radio receiver A noise eliminator for a radio receiver comprises an automatic gain control amplifier for amplifying a noise signal extracted from an intermediate-frequency signal or a detector output signal of the receiver, a circuit for producing a faithfully pulsating... | 10/06/1981 |
| 4282401 | System for transmission and reception of discrete four channel stereo A system for transmission and reception of discrete four channel stereo for utilizing a carrier frequency modulated in accordance with a modulation function of the form: where A=LF+LR+RR+RF, B=LF+LR-RR-RF, C=LF-LR=RR+RF, D=LF-LR+RR-RF, LF, LR, RR and RF are au... | 08/04/1981 |
| 4249038 | Stereo decoder with 19KHz-pilot suppression and improved oscillator phase locking Stereo decoder for multiplex signals comprising a demultiplexer for decoding the left-hand and the right-hand sound signal of a stereo multiplex signal, a phase-locked loop which includes a phase-locked oscillator and a multiplicative phase detector, and ... | 02/03/1981 |
| 4246440 | Radio broadcasting system with code signalling FM radio broadcasting is disclosed with code signalling by means of a subcarrier wave in the free frequency range around the stereo pilot on one side of said pilot (or of two subcarrier waves in said frequency range on both sides of the stereo pilot). The... | 01/20/1981 |
| 4232393 | Muting arrangement of a radio receiver with a phase-locked loop frequency synthesizer In a muting arrangement of a radio receiver using a phase-locked loop frequency synthesizer as a local osicillator, a detector detects an in-lock or out-of-lock state of the phase-locked loop through an output state of a phase comparator included in a fee... | 11/04/1980 |
| 4232191 | FM Receiving device A double super heterodyne FM receiver having a first local oscillator for deriving a first intermediate frequency signal from an FM input signal, tuning means for varying the frequency of the first local oscillator to tune the FM receiver to a predetermin... | 11/04/1980 |
| 4199761 | Multichannel radio communication system for automated power line distribution networks An automated electric power distribution network includes a radio communication system for transmitting multipurpose, multitone signals in one or more signaling channels over the auxiliary channel or channels of one or more commercial broadcast stations. ... | 04/22/1980 |
| 4160217 | Phase locked loop circuit A phase locked loop includes a variable frequency oscillator, a phase comparator for comparing the phase between an output signal derived from the variable frequency oscillator and a reference signal and for generating a control signal in response to the ... | 07/03/1979 |
| 4124780 | FM stereophonic receiver providing a test signal An FM stereophonic receiver includes a system for producing a test signal having an audio frequency and a constant amplitude, permitting an easy setting of the input level of a tape-recorder which will record an FM program through the receiver. The system... | 11/07/1978 |
| 4093824 | Receiver having a phase-locked loop A receiver incorporating a phase-locked loop to demodulate a signal comprising a plurality of distinct baseband components is disclosed. The loop filter circuit includes an adjustable resistive element for varying the loop damping factor, thereby providin... | 06/06/1978 |
| 4084139 | Shoulder supported stereophonic radio receiver A portable radio receiver including a pair of loudspeakers for reproducing stereo signal sources is provided with a unitary, generally U-shaped, substantially rigid, component enclosing and supporting structure adapted to be carried on the shoulders of a ... | 04/11/1978 |
| 4076963 | Pilot signal cancelling circuit for FM multiplex demodulator A pilot signal cancelling circuit for an FM multiplex demodulator wherein the amplitude of the cancelling signal tracks that of the pilot signal contained in or mixed into the composite signal. The amplified composite signal is synchronously detected with... | 02/28/1978 |
| 4063042 | Circuit arrangement for decoding a frequency modulated stereo radio signal A circuit arrangement for decoding a frequency-modulated stereo radio signal includes a FM demodulator followed by a stereo decoder and a matrix. In the matrix, by sum and difference formation, two reproduction signals are formed from a sum signal compone... | 12/13/1977 |
| 4049918 | MPX stereo signal demodulator A multiplex (MPX) stereo signal demodulator includes a first differential amplifier supplied with a composite stereo signal and second, third differential amplifiers cascode-connected to the first differential amplifier and supplied with a 38 KHz subcarri... | 09/20/1977 |
| 4047116 | FM multiplex stereo demodulating circuit An FM multiplex stereo demodulating circuit for obtaining separated left and right channel signals from a composite signal containing a stereophonic signal and a pilot signal, wherein the pilot signal component in the composite signal to be applied to a m... | 09/06/1977 |
| 4037165 | Synchronous signal generating system with phase-locked loop circuit A composite signal consisting of a plurality of signals of different frequencies is applied via a cancelling circuit to a phase-locked loop circuit which is adapted to be locked with a certain signal contained in the composite signal to generate a signal ... | 07/19/1977 |
| 4030036 | Bandwidth changing circuit A bandwidth changing circuit comprising first and second transistors connected in differential configuration, a narrowband filter whose output is connected to an input electrode of the first transistor, and a switching circuit. The switching circuit is re... | 06/14/1977 |
| 4002991 | Pilot signal extracting circuitry A pilot signal extracting circuitry designed to extract, from a composite signal consisting of plural signals modulated by a suppressed carrier modulation system, a pilot signal for controlling the generation of a carrierwave which is used for the demodul... | 01/11/1977 |
| 3991374 | Controllable bandwidth IF filter circuit for radio receivers Controllable bandwidth IF filter circuit for radio receivers generally, but having particular application to quadraphonic radio receivers intended for use in a quadraphonic system that is compatible with existing monophonic and biphonic equipment, said fi... | 11/09/1976 |
| 3950620 | Electric circuit containing an integral phase-locked loop A circuit containing an integral phase-locked loop and operative in a first mode, in which the loop is required, and in a second mode in which the loop is not required; and means for selectively rendering the loop inoperative by selectively disabling the ... | 04/13/1976 |
| 3936594 | Secure television system A secure system for television transmission wherein a television signal is transmitted on one frequency channel and a composite high fidelity stereophonic audio signal is transmitted on a separate unrelated frequency channel. Unauthorized reception of the... | 02/03/1976 |
