Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 7330271 | Electromagnetic resonant sensor with dielectric body and variable gap cavity An electromagnetic resonant sensor has a dielectric sensor body through which electromagnetic wave energy is propagated. The sensor body has a cavity, with surfaces facing one another to define a gap that varies as a function of a parameter to be measured. The reson... | 02/12/2008 |
| 7224248 | Ceramic loaded temperature compensating tunable cavity filter A high Q RF cavity resonator loaded with a ceramic disc, the resonator comprising an inner conductive post having a length less than a quarter wavelength. The resonance frequency of the resonator is tunable by changing a distance between a) an outer plate and b) a c... | 05/29/2007 |
| 7100447 | Super Invar magnetic return path for high performance accelerometers A force rebalance accelerometer (20) includes a silicon dioxide-based proof mass (28) having capacitive elements (40) engaged with excitation rings (61) made from alloys of Super Invar. The magnet assembly includes an excitation ring, a m... | 09/05/2006 |
| 6960747 | Microwave applicator system A microwave applicator for heating loads being a waveguide transition between the rectangular TE10 and TE20 modes comprising a TE10 mode section and a TE20 mode section. The location of the load being inside said TE20... | 11/01/2005 |
| 6727787 | Method and device for achieving a high-Q microwave resonant cavity A device for manipulating microwave radiation includes a substrate that defines the shape of a surface for reflecting microwave radiation. The device also includes a metal fitting. The fitting conforms to the defined shape, and provides the surface that reflects mic... | 04/27/2004 |
| 6657214 | Shielded enclosure for testing wireless communication devices A test system having a shielded enclosure and common air interface for testing the transmit and receive functionality of wireless communication devices such as mobile phones. A test system according to the present invention provides improved fault coverag... | 12/02/2003 |
| 6518857 | Multimode dielectric resonator apparatus, filter, duplexer, and communication apparatus A multimode dielectric resonator apparatus is configured such that a TM mode and a TE mode are transformed into multiplex modes, coupling between individual resonant modes can be easily made, and a large number of sequentially coupled stages can be obtain... | 02/11/2003 |
| 6329645 | Apparatus for dampening standing wave pattern generation in microwave oven An apparatus for dampening standing wave pattern generation in a closed cavity of a microwave oven, includes a fluid table having an enclosure made of a microwave energy transparent material, such as plastic, and a structure, such as top flat platform hel... | 12/11/2001 |
| 5828040 | Rectangular microwave heating applicator with hybrid modes A microwave applicator of microwave reflective material having a closed first end, four side walls and, in a first embodiment, an open second end spaced apart from and facing a ground plate, the ground plate extending in a pair of transverse directions an... | 10/27/1998 |
| 5317234 | Mode trap for absorbing transverse modes of an accelerated electron beam A mode trap to trap and absorb transverse modes formed by a beam in a linear accelerator includes a waveguide having a multiplicity of electrically conductive (preferably copper) irises and rings, each iris and ring including an aperture, and the irises a... | 05/31/1994 |
| 5296457 | Clamshell microwave cavities having a superconductive coating A microwave cavity including a pair of opposing clamshell halves, such halves comprised of a metal selected from the group consisting of silver, copper, or a silver-based alloy, wherein the cavity is further characterized as exhibiting a dominant TE0... | 03/22/1994 |
| 5187408 | Quasi-optical component and gyrotron having undesired microwave radiation absorbing means A quasi-optical component for microwave radiation comprises a quasi-optical element (16a) which radiates incident microwave radiation along a major axis (19) and which has a characteristic transverse dimension (D) which is smaller than 50-times one wavele... | 02/16/1993 |
| 5075867 | Method for limiting spurious resonant cavity effects in electronic equipment Spurious cavity resonance effects in a cabinet housing electronics circuitry are suppressed by determining the maximum repetition rate or frequency for legitimate signals which can appear in the circuitry and then establishing the dimensions of each cavit... | 12/24/1991 |
| 5059929 | Dielectric resonator A dielectric resonator comprising a dielectric unit which is constructed by piling a plurality of plate-shaped dielectrics one on the other under pressure or adhering dielectrics to each other, so as to prevent an electric field in a resonance mode other ... | 10/22/1991 |
| 5017881 | Radio frequency accelerating cavity having slotted irises for damping certain electromagnetic modes An accelerating cavity having one or more iris structures mounted therein for strongly damping unwanted frequencies that are generated in the cavity by bunches of particles in a particle beam that is accelerated through the cavity during its operation. Ea... | 05/21/1991 |
| 4851788 | Mode suppressors for whispering gallery gyrotron A gyrotron interaction resonator 29 operating in a TEn1 cavity mode has an array of longitudinal slots 32 in the conductive wall 30. The slots 32 are spaced to couple to the unwanted TEn1 modes and to other modes of differing n and n... | 07/25/1989 |
| 4849724 | Waveguide band-pass filter A waveguide band-pass filter has at least two resonators each consisting of a high-impedance section and a low-impedance section. The resonators are cascade-connected at intervals of λg/4 in a waveguide.... | 07/18/1989 |
| 4802234 | Mode selective band pass filter A microwave band pass filter for filtering electromagnetic signals has a set of cavities arranged serially, with a block of dielectric material filling each cavity to define regions of each cavity which are loaded with dielectric material and regions whic... | 01/31/1989 |
| 4794340 | Synchrotron-type accelerator with rod-shaped damping antenna A synchrotron-type accelerator of the invention has a torus-shaped beam duct and an acceleration section inserted in the beam duct. The acceleraton section has an accelerating cavity communicating with the interior of the beam duct. An RF electric field i... | 12/27/1988 |
| 4782312 | Mode selective magnetostatic wave resonators A resonator in which the input and output transducers are positioned to couple strongly into a resonant mode of interest. Signal drains are included to drain energy out of spurious resonant modes. In a magnetostatic wave resonator, the signal drains are p... | 11/01/1988 |
| 4710729 | Microwave oscillator comprising a dielectric resonator insensitive to mechanical vibrations A microwave oscillator (11) stabilized by a dielectric resonator (12) constituted by a housing (13) accommodating the dielectric resonator circuit and haing a fixing surface (14) and by a support (15) having an outer surface (16) on which the housing (13)... | 12/01/1987 |
| 4705988 | Device for guiding an electron beam A device for guiding an electron beam from an electron gun to a microwave resonator in a microwave source operating according to the gyrotron principle, including a beam duct for guiding the electron beam, wherein the beam duct encloses the electron beam ... | 11/10/1987 |
| 4673894 | Oscillator coupled through cylindrical cavity for generating low noise microwaves A microwave oscillator having very low phase noise characteristics has a reflection oscillator circuit coupled to a right-circular cylindrical resonant cavity designed to operate in the TE011 mode. The resonator length L and inner diameter D ar... | 06/16/1987 |
| 4661744 | Electromagnetic energy generators having resonating cavity with reflecting zones A generator of short electromagnetic waves is provided with a novel form of resonant cavity having improved mode selectivity. The reflecting walls of the cavity correspond to a surface of revolution and the meridian planes include four discrete mirror zon... | 04/28/1987 |
| 4547754 | Ferromagnetic resonator A ferromagnetic resonator employing a disk of ferrimagnetic material is disclosed. The ferromagnetic resonator comprises a disk of ferrimagnetic material such as yttrium iron garnet (YIG) and a magnet applying D.C. magnetic field perpendicularly to a surf... | 10/15/1985 |
| 4540960 | Monochromatic radio frequency accelerating cavity A radio frequency resonant cavity having a fundamental resonant frequency and characterized by being free of spurious modes. A plurality of spaced electrically conductive bars are arranged in a generally cylindrical array within the cavity to define a cha... | 09/10/1985 |
| 4529911 | Absorber For damping undesired high frequency electromagnetic oscillations on HF technology components, such as coaxial lines, waveguides and resonators, as well as for the use in resonant circuits of VHF amplifiers with high HF power electron tubes, an absorber i... | 07/16/1985 |
| 4439747 | Method for improving selectivity in cylindrical TE011 filters by TE211 /TE311 mode control A method for designing low loss cylindrical TE011 mode resonators which permits selective placement of a transmission null at a frequency near the TE011 resonance frequency. The frequencies of the TE211 and TE311 | 03/27/1984 |
| 4415789 | Microwave oven having controllable frequency microwave power source A microwave oven comprising a heating cavity, a controllable frequency microwave power source, a detector for detecting the intensity of the electric field in the cavity and control means for setting the microwave power source at the frequency as determin... | 11/15/1983 |
| 4398121 | Mode suppression means for gyrotron cavities In a gyrotron electron tube of the gyro-klystron or gyro-monotron type, having a cavity supporting an electromagnetic mode with circular electric field, spurious resonances can occur in modes having noncircular electric field. These spurious resonances ar... | 08/09/1983 |
| 4387467 | Satellite test chamber with electromagnetic reflection and resonance damping for simulating system generated electromagnetic pulses The simulation of systems generated electromagnetic pulses in a space environment for satellite testing is accomplished by means of a spherical test chamber that is coupled with a pulsed x-ray source. Resonance damping is provided by a spherical resistive... | 06/07/1983 |
| 4340870 | Efficient higher order mode resonant combiner An efficient higher order mode resonant combiner in which a higher order mode accumulator cavity is adjusted to have the real part of its input characteristic impedance to be so minimized as to be less than the characteristic impedance Zo of th... | 07/20/1982 |
| 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 |
| 4215313 | Dielectric image guide integrated harmonic pumped mixer The specification describes a dielectric image guide harmonic pumped mixer circuit wherein two dielectric image guide strips of different chosen cross-sectional configurations are mounted on a metallic substrate which forms the image plane for the mixer c... | 07/29/1980 |
| 4189684 | Microwave power combiner A microwave power combiner is shown to consist of a plurality of coaxial diode oscillators disposed on the periphery of a circularly cylindrical cavity operating in the TM020 mode, such cavity containing mode suppressor means to prevent any mod... | 02/19/1980 |
| 4188600 | Cavity resonator having ancillary cylinder for suppressing parasitic mode A conductive body with a cylindrical cavity, designed to resonate at a certain operating frequency in the TE01 mode, has an input opening at one end and a conductive insert at the opposite end which alters the effective axial length for parasit... | 02/12/1980 |
| 4174492 | Device for attenuating cavity interference waves in a high-frequency electron tube A device for attenuating electromagnetic cavity interference waves, which occur in the vacuum system of a high-frequency electron tube, in particular a transmitting tube, comprising a wave-guide portion coupled to the cavity of the electron tube, which ma... | 11/13/1979 |
| 4156860 | Temperature compensation apparatus for a resonant microwave cavity A device for a resonant microwave cavity which includes a tuning plunger assembly to make the resonant frequency less temperature sensitive. The frequency response of a cavity filter, determined by its resonant frequency, primarily depends on the dimensio... | 05/29/1979 |
| 4047180 | Broadband corrugated horn antenna with radome A broadband (8-18 GHz) radomed horn antenna system comprises a conical horn having broadband slots on the inner surface and a radome having a frusto-conical side wall and a spherically shaped transverse wall inserted into the horn. The radome wall is thin... | 09/06/1977 |
