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Reward Candy Dispenser for Personal Computers
A personal computer peripheral, battery powered reward candy dispenser which immediately presents students with a single candy for each problem completed correctly.
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| Number | Title | Issue Date |
| 4238747 | Mode filter apparatus A mode filter apparatus for preventing unwanted modes in a multi-moded structure utilizing a radial plurality of resonant slots on the bottom of the filter cavity. The top of the filter cavity includes a variable height center section to provide mode sele... | 12/09/1980 |
| 4189683 | Solid state diode amplifier An amplifier using a plurality of solid state diodes as the active elements is shown to comprise a plurality of amplifier channels fed, through a first radial line, by signals to be amplified and connected, through a second radial line, to a load.... | 02/19/1980 |
| 4175257 | Modular microwave power combiner A modular microwave power combiner having a plurality of identical microwave diode amplifier circuits grouped in sets within the body of a modular unit which are electrically coupled in parallel to a central cavity sized to be resonant at a single frequen... | 11/20/1979 |
| 4121174 | Adjustable microwave power combiner for plurality of coaxial circuits A power combining device for combining the microwave power from a plurality of solid state devices comprises a housing defining a resonator cavity with a plurality of co-axial microwave circuits, including a microwave diode at one end of each circuit and ... | 10/17/1978 |
| 4091334 | Connection of a plurality of devices to a circular waveguide A hollow cylinder that has a permittivity greater than the permittivity of air is coaxially disposed within a waveguide with the proximal end of the cylinder coplanar with one end of the waveguide. The cylinder has a metal clad surface wherein a plurality... | 05/23/1978 |
| 4086543 | Travelling wave hybrid junction amplifier The basic module of a microwave Travelling-Wave Hybrid Junction amplifier (TWHJ) consists of a hybrid junction (0°, 180° or 90° hybrid) combined with an appropriate phase-shifting element (π/2 element is needed for 0° and 180° hybrids and no element... | 04/25/1978 |
| 4063186 | Broadband millimeter wave amplifier A millimeter wave amplifier having broadband characteristics in which a G diode or other two terminal negative resistance device having an integral heat sink is center mounted in a reduced height waveguide. The heat sink is attached to a mechanism for se... | 12/13/1977 |
| 4056784 | Suppression of parametric oscillations in IMPATT amplifiers and oscillators A balanced circuit for IMPATT amplifiers and oscillators, which includes at least one pair of anti-series connected matched avalanche diodes electrically connected to the junction of a balanced and an unbalanced transmission line is disclosed. The diodes ... | 11/01/1977 |
| 4050032 | Avalanche diode amplifier A microwave amplifier is disclosed using a nonreciprocal three port junction circulator. The amplifier uses a ferrite circulator having an input port, an output port and a third electrical port. A semiconductor device such as an IMPATT diode having negati... | 09/20/1977 |
| 4028637 | Parametrically-stable negative resistance diode circuit A parametrically-stable microwave circuit comprises in cascade a negative resistance diode, a stabilizing network, and a complementary type filter. The complementary type filter presents a substantially constant impedance to the stabilizing network from l... | 06/07/1977 |
| 4025872 | Negative resistance network A network characterized at a reference terminal pair by a negative resistance at a frequency near nfo, where n is an integer greater than one. The network comprises a circuit element characterized by a negative resistance at frequencies in the ... | 05/24/1977 |
| 4021750 | Broad-band TRAPATT amplifier having a tapered idler circuit A broad-band microwave amplifier including a semiconductor TRAPATT diode generating a microwave signal at its fundamental, second and third harmonic frequencies. Energy is extracted at the second harmonic frequency and a certain impedance loading is provi... | 05/03/1977 |
| 4017805 | Compensated electron beam deflection device An electron beam deflection amplifier having two spaced parallel electron ams and a pair of spaced collector electrodes for intercepting the beams to provide an output beam current. The beams are deflected in opposite directions by the input signal to be ... | 04/12/1977 |
| 4013974 | Microstrip broadband avalanche diode amplifier A broadband Impatt diode amplifier for microstrip includes a two-section quarter wavelength impedance transformer. Since the width of one transformer section exceeds a half wavelength, spurious mode resonance is suppressed using a longitudinal slot with a... | 03/22/1977 |
| 4009446 | Dual diode microwave amplifier A Microwave reflection amplifier having improved gain, bandwidth and noise characteristics, uses two negative-resistance diodes, such as Gunn-effect diodes, connected in series across the terminals. The diodes are series resonated by inductance in their l... | 02/22/1977 |
| 4005372 | Frequency tunable microwave apparatus having a variable impedance hybrid idler circuit A frequency tunable microwave apparatus including a semiconductor TRAPATT diode generating a microwave signal at its fundamental, second and third harmonic frequencies. Energy is extracted at the second harmonic frequency and a certain impedance loading i... | 01/25/1977 |
| 3996529 | Varactor tuning apparatus for a strip transmission line device A varactor tuning apparatus for tuning a strip transmission line radio frequency device, wherein the device having predetermined operating characteristics includes an active element such as an avalanche diode and a resonant conductive strip section. The t... | 12/07/1976 |
| 3986153 | Active millimeter-wave integrated circuit An active millimeter wave integrated circuit including a thin non-metallic waveguiding layer mounted on an image plane and having an opening therein which exposes a given area of the image plane. An active solid state device, such as a millimeter wave dio... | 10/12/1976 |
| 3974459 | Millimeter waveguide oscillator and amplifier structure Disclosed is a millimeter wave waveguide structure adapted for operation with negative resistance devices, such as solid state avalanche breakdown diodes, at frequencies up to about 170 GHz or higher. A central portion of the structure is formed by a cyli... | 08/10/1976 |
| 3943463 | Tunable oscillator/amplifier circuit for millimeter-wave diodes Disclosed is microwave oscillator or amplifier circuitry which is tunable over a wide bandwidth and which includes an improved variable loading on a negative resistance semiconductor diode, such as an IMPATT diode. This loading is provided in mutually per... | 03/09/1976 |
| 3942130 | Coax-to-radial transition A transmission line transition for coupling together a coaxial transmission line and a parallel plane radial transmission line, the transition including upper and lower circular plates having conforming inner curved surfaces spaced from each other to defi... | 03/02/1976 |
| 3931587 | Microwave power accumulator Disclosed is a microwave power accumulator including a plurality of coaxial oscillator circuits, each tightly coupled to a single common output combining resonant cavity. Each of the coaxial circuits includes a negative resistance diode at one end and a l... | 01/06/1976 |
