Bizarre Patents
Wearable Device For Feeding and Observing Birds and Other Flying Animals
A device for feeding and observing flying animals comprising a hat, a support mounted on the hat and extending outward from the hat, and a feeder mounted on the support.
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| Number | Title | Issue Date |
| 5138205 | Synchronized thyristor firing control The invention pertains to electrical power control more particularly to a class of circuitry known as thyristor phase control. The novel circuit can be used to control heating devices, electrical motors and generators and many other types of equipment tha... | 08/11/1992 |
| 5089720 | Bridge type switching circuit having a single switchable current source A sample-and-hold circuit comprising a diode bridge that includes a first serial branch including first (T1) and second (D3) D.C. diodes connected in parallel with a second serial branch including third (T2) and fourth (D | 02/18/1992 |
| 5036219 | Precise, high speed CMOS track (sample)/hold circuits A precise, high speed CMOS track (sample)/hold circuit uses a first circuit leg including four Schottky barrier diodes configured to form a Wheatstone bridge, a second leg with a single n-channel MOS transistor, an essentially constant current source havi... | 07/30/1991 |
| 4982107 | Sourcing or sinking output circuit The present invention provides an output signal comprising a sourcing or sinking current for a sensor or control device. The type of output generated by the sensor or control device depends upon the polarity of the power supply. The DC circuit of the pres... | 01/01/1991 |
| 4931707 | Impedance matching circuit The disclosure describes an impedance matching circuit for maintaining the input impedance, of a drive transistor as sensed by a driver circuit, substantially constant. The circuit is connected to the input of the drive transistor such that when the drive... | 06/05/1990 |
| 4885545 | High speed circuit with supporting auxiliary circuit A sample-and-hold circuit for sampling a time-varying signal comprises a main sample-and-hold subcircuit extending between input and output terminals and an auxiliary sample-and-hold subcircuit extending between the input terminal and a portion of the mai... | 12/05/1989 |
| 4751468 | Tracking sample and hold phase detector A tracking sample and hold phase detector operating as an error sampled feedback loop which takes signal samples during successive periods of an input signal with a sampling gate, holds the signal sample in a storage gate, and feeds back the sample to the... | 06/14/1988 |
| 4745300 | Two-wire switch The invention relates to a two-wire switch for connecting a load to an ac ltage source, and, in particular, to a two-wire switch with an auxiliary voltage source. A capacitor acting as charge storage device can be charged by the auxiliary voltage source w... | 05/17/1988 |
| 4717841 | Static power switch apparatus The disclosure relates to a static power switch circuit having a power switch member having a bidirectional power switch with at least one controlled semiconductor of the thyristor or triac type with power terminals connected to an AC source in series wit... | 01/05/1988 |
| 4659945 | Sampling bridge A high frequency sample and hold circuit has a sampling diode bridge for coupling an input test signal to be sampled to a holding capacitor when all of the diodes of the bridge are forward biased by an applied strobe signal, thereby charging the capacitor... | 04/21/1987 |
| 4642481 | Solid state hybrid switch A hybrid switch (2) having a solid state circuit (2a) including a thyristor (SCR) for closing and reopening a supply circuit (S,4,6) to a load (L) and contacts including an isolating contact (S1) for connecting power to and disconnecting power from the so... | 02/10/1987 |
| 4618922 | Isolated control signal source A circuit arrangement is provided for a command source directing operation of a subsequent circuit. This command source circuit, based on using cross-coupled transistors, is electrically isolated from the subsequent circuit when no commands are being gene... | 10/21/1986 |
| 4572971 | Tri-state driver circuit for automatic test equipment A tri-state driver circuit 10 for selectively driving a node of a device under test by applying and switching between two reference voltages, and for selectively operating at a high impedance output state. Two current sources 16 and 18 provide a bridge cu... | 02/25/1986 |
| 4540902 | Sample and hold circuit A sample and hold circuit is disclosed, in which first and second terminals to which are supplied drive currents for turning ON and OFF a diode bridge are respectively connected through capacitors to a connection point between output electrodes of switchi... | 09/10/1985 |
| 4518921 | Track and hold circuit A track and hold circuit comprising an electronic switch and a signal storing device. During a tracking interval, the switch couples a varying input signal from an input node to the storing device in response to at least one track control signal. In a hol... | 05/21/1985 |
| 4433308 | PLL Detection circuit A time constant resistor in a phase lock loop filter is short-circuited by a plurality of diodes which are activated in response to a detection output indicating that the filter output is within a desired locking range.... | 02/21/1984 |
| 4418712 | Overflow control system An overflow control system for use with home appliances such as washing machines, incorporating conventional stand pipe which receives the outlet conduit from the appliance, the stand pipe being provided with an attachment having a displacement, conductiv... | 12/06/1983 |
| 4412138 | Pulse generator circuit A pulse generator circuit generates pulses or logic signals with variable upper and lower levels. According to a preferred embodiment of this invention there are provided two variable voltage sources representing variable logic state levels. For alternate... | 10/25/1983 |
| 4408269 | Balanced power supply with polarized capacitors A balanced, constant current power supply having two rectifying bridges coupled in parallel is energized by an AC source for generating a plurality of DC output voltages. The parallel arrangement of diode rectifying bridges permits the use of low cost, po... | 10/04/1983 |
| 4323799 | Impulse activated time delay self-restoring switch An impulse activated switch having a controlled time-delayed self-restoration from its complementary state to its initial state is described. Upon illumination, a photodiode array connected to the gate and source electrodes of a field effect transistor pr... | 04/06/1982 |
| 4306161 | Simple method of switching an AC line A switching circuit for an alternating current line allows the voltage or rrent coupled from the line to a load circuit to be controlled. Control may be in response to changes in voltage or current coupled as a feedback signal from the load to a switching... | 12/15/1981 |
| 4283638 | Field effect transistor switched temperature control circuit Two field effect transistor device means are utilized in conjunction with a special type of transformer having a low impedance primary winding and a high impedance primary winding to energize a secondary circuit to supply power for operating the electroni... | 08/11/1981 |
| 4230956 | 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... | 10/28/1980 |
| 4209711 | Transistor power circuit with preventive diode bridge Chopped current is supplied to an inductive load from a DC source that is switched by a pair of transistors having stacked emitter-collector paths between terminals of the source. Bases of the transistors are driven so that current can be supplied to the ... | 06/24/1980 |
| 4194202 | Grid pulsed oscillator and detector 5. A pulse doppler proximity fuze comprising a self-pulsing oscillator for eveloping a series of radio frequency electromagnetic energy impulses, an antenna electrically connected to said oscillator for radiating said impulses into space and for intercepti... | 03/18/1980 |
| 4176288 | Zero voltage switching solid state relay A solid state relay or controlled switch for connecting an AC power source to a load includes a solid state switching circuit in which a semiconductor controlled rectifier element, such as a photothyristor, thyristor or light-AC controlled element, is ign... | 11/27/1979 |
| 4156276 | Effective value converting circuit An effective-value converting circuit comprising a rectifier circuit of which four arms are composed of diodes to rectify an a-c input, a temperature compensating diode connected between the output terminals of the rectifier circuit in series with a plura... | 05/22/1979 |
| 4097769 | Circuit for controllably providing power from an AC source to a load A transformerless triac control circuit provides direct on/off control of loads including loads requiring a high current. An on/off decision is made twice each period of the source voltage, and the on/off decision results from the happening or the nonhapp... | 06/27/1978 |
| 4054805 | Electronic switching device A field effect transistor of the N junction, P junction, or MOS FET type and having a load connected in series with its source and drain electrodes is normally biased off by a diode circuit which causes the FET to conduct when an input voltage is applied ... | 10/18/1977 |
| 4049976 | Solid-state voltage switching circuit A circuit for switching a voltage between a pair of terminals by means of a thyristor, preferably a silicon controlled rectifier (SCR), connected at its anode to one of the terminals and at its cathode to the other terminal, is characterized by a control ... | 09/20/1977 |
| 4048522 | Solid state break-before-make base module and associated contact elements Solid state relay system which includes a break-before-make function on both the opening and closing operation thereof is taught. The system may be utilized in conjunction with an "on" delay module or an "off" delay module or with a module that is general... | 09/13/1977 |
| 4027325 | Integrated full wave diode bridge rectifier A full wave rectifying junction-diode bridge rectifier is formed in an integrated silicon circuit. One of the two bridge output terminals is ohmically connected to the bulk doped silicon body so that this portion of the body may serve as the ground refere... | 05/31/1977 |
| 4002929 | A.C. type timer circuit Contactless two-line type timer circuit operable stably for a load of even a small current. In the circuit comprising substantially a full-wave rectifying circuit connected through the load to AC source, a thyristor connected across output terminals of th... | 01/11/1977 |
| 3961204 | Firing circuit for an electric valve The invention concerns a circuit arrangement for firing an electric valve, particularly a thyristor, with a pulse capacitor which can be charged from the a-c voltage at the anode-cathode path of the electric valve by means of an external resistor and can ... | 06/01/1976 |
| 3947782 | Diode ring mixer A diode ring mixer in which a coupling loop between two ferrite spheres is constructed as a double conductor. The coupling loops for the symmetrical input and symmetrical output are branched off in a coupling space halfway their line length.... | 03/30/1976 |
| 3934158 | Switching circuit An improved switching means is provided in a loudspeaker system, which includes a power amplifier of direct coupled type having no output condensor to deliver an audio-frequency current to the loudspeaker, to eliminate undesirable effects by rapidly break... | 01/20/1976 |
