Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
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| Number | Title | Issue Date |
| 4426631 | Ceramic bandstop filter An embodiment of a unique ceramic bandstop filter is comprised of a dielectric plate having an input electrode disposed centrally on the top surface thereof and a dielectric block fixedly attached to the bottom surface of the plate and having a hole oppos... | 01/17/1984 |
| 4422058 | Folded-over helical resonator A helical resonator includes a helical coil with one end flared out and folded back over a portion of the cylindrical helix made by the coil to create a winding of opposite pitch superimposed over the cylindrical helix. As an alternative design, a resonat... | 12/20/1983 |
| 4398164 | Coaxial resonator A 1/4 wave length coaxial resonator comprises an outer cylindrical portion, an inner cylindrical portion positioned coaxially in the outer cylindrical portion, with the outer and inner cylindrical portions connected at one end by a radial connecting porti... | 08/09/1983 |
| 4386328 | High frequency filter A high frequency filter for frequencies higher than the VHF band comprising of a closed conductive housing (53), a pair of input and/or output means (54) like an antenna provided at both the extreme ends (53-5, 53-6) of said housing (53), a plurality of r... | 05/31/1983 |
| 4361820 | Hybrid microwave circuit A coaxial type microwave filter having an outer conductor and at least one inner conductor supported in the outer conductor has a strip transmission line extending from an external strip-line circuit to the inner conductor through an opening in the outer ... | 11/30/1982 |
| 4344052 | Distributed array of Josephson devices with coherence Josephson devices are distributed in series in a transmission line structure in which electromagnetic waves are used to synchronize the dynamics of the Josephson devices in order to achieve coherence between the devices. Electromagnetic waves, such as osc... | 08/10/1982 |
| 4342972 | Microwave device employing coaxial resonator The disclosure relates to an improved microwave device which includes a casing of electrically conductive material, at least two coaxial resonators, for example, 1/4 wavelength coaxial TEM resonators each having dielectric member disposed between an inner... | 08/03/1982 |
| 4318064 | Resonator for high frequency electromagnetic oscillations A resonator for a high frequency electromagnetic oscillator is disclosed. The resonator includes a hollow cylinder formed of a material having a low dielectric constant and a dielectric wire formed of a material having a higher dielectric constant and loc... | 03/02/1982 |
| 4292610 | Temperature compensated coaxial resonator having inner, outer and intermediate conductors A coaxial cavity resonator comprising an outer conductor and an inner conductor coaxially disposed in the outer conductor with one end of the inner conductor being connected to an end wall of the outer conductor to establish a short-circuit relationship a... | 09/29/1981 |
| 4287494 | Distributed constant type filter A filter operable in a microwave frequency band comprises a conductive closed housing having a bottom wall, an upper wall and side walls between said bottom wall and the upper wall, a plurality of resonators fixed on a straight line on the bottom wall ins... | 09/01/1981 |
| 4284966 | Wide bandwidth helical resonator filter A helical resonator filter with increased bandwidth is provided for use as a wideband bandpass filter. The device is composed of a series of helical resonators cells cascaded with non-uniform cell spacing, thus providing an increase in coupling coefficien... | 08/18/1981 |
| 4264881 | Microwave device provided with a 1/2 lambda resonator A microwave device is disclosed comprising a microstrip line pattern including an open ring forming a 1/2λ resonator having a narrow gap in which the electromagnetic field is closely tied to the ring.... | 04/28/1981 |
| 4262269 | Q Enhanced resonator An active microwave filter for use in both bandpass and notch filter applications is herein described, the filter incorporating a distributed resonator to which is coupled an amplifier which provides a positive feedback and cancels the net dissipation in ... | 04/14/1981 |
| 4257020 | Piezoelectric resonator A piezoelectric resonator comprises a crystal having an outer peripheral portion connected to a central portion by an intermediate zone which is short in the radial direction, is hollowed out over its major part and has at least two connector bridges betw... | 03/17/1981 |
| 4254390 | Compact electronic tuning device A tuning device including a conductive housing in which are suspended a dielectric substrate. A pair of first and second resonant circuits is disposed on the substrate in parallel with each other. Each resonant circuit is formed by an elongated conductive... | 03/03/1981 |
| 4245198 | High frequency filter device A filter device has two filters for filtering or separating two high-frequency signals having different frequencies. Each filter comprises a plurality of quarterwavelength coaxial resonators, cables for connecting the filters with terminals, and a casing ... | 01/13/1981 |
| 4193047 | Frequency selective ferrimagnetic power limiter Two sectoral radial resonators coupled at their centers of radii by a strip transmission line and doubly loaded with opposing ferrimagnetic spheres between the said strip transmission line and the ground planes provides a frequency selective power limiter... | 03/11/1980 |
| 4188599 | Inductance coil for telecommunication system and method of making same A conductive coil, designed to be used as an inductance in a resonant cavity, comprises a metal strip integrally cut or etched from a sheet with a branch diverging from the main stem of the strip in the vicinity of one extremity thereof bent at an obtuse ... | 02/12/1980 |
| 4104558 | Tunable radio frequency pulse generators A tunable frequency pulse generator capable of providing high energy pulses having an in-line construction includes an annularly shaped spark gap and a movable insulator support which includes a conductive sleeve that varies the resonant frequency of the ... | 08/01/1978 |
| 4104556 | High energy radio frequency pulse generators A radio frequency pulse generator capable of providing high energy pulses having an in-line construction includes an annularly shaped spark gap. The input voltage is connected to the resonant element through a central aperture provided in the spark gap ri... | 08/01/1978 |
| 4104557 | Liquid dielectric radio frequency pulse generators A liquid dielectric radio frequency pulse generator capable of providing high energy pulses having an in-line construction includes an annularly shaped spark gap immersed in an aprotic liquid such as molten sulfur, sulfur monochloride or mixtures thereof.... | 08/01/1978 |
| 4053856 | Quasi-toroidal inductor and resonator An inductor comprises a quasi-toroidal conductive envelope having a discontinuity across which alternating voltage may be applied. The inductor may comprise a plurality of interrupted turns connected in parallel or may be formed by a continuous conductive... | 10/11/1977 |
| 4051449 | Time frequency diversity system A plurality of signals to be separated in time as well as in frequency are imultaneously applied to the input of a power amplifier whose output is applied to the input of a fast-tuned filter. The filter is capable of being almost-instantaneously tuned to a... | 09/27/1977 |
| 4019161 | Temperature compensated dielectric resonator device A temperature compensated dielectric resonator device is composed of a dielectric resonator element mounted on a micro-integrated circuit (MIC) plane. A screw is provided for manually regulating the frequency of the device and a supporting member supporti... | 04/19/1977 |
| 3970972 | Shock resistant, temperature compensated helical resonator A temperature compensated helical resonator structure having a rigid dielectric filling between helix and shield of a material with a negative thermal coefficient of permittivity. The filling provides shock resistance by preventing the helix from vibratin... | 07/20/1976 |
| 3967223 | Resonant ring transmission line having a high Q mode A resonant ring transmission line capable of exhibiting a Q greater than 6000 at 4.3 gigahertz and a transmission line loss of less than 1 db per kilometer. This is accomplished by means of a resonant ring transmission line coupled to a microstrip transmi... | 06/29/1976 |
| 3935552 | Two reference cavity structure for frequency tracking as a function of temperature A two reference cavity structure for tracking the frequency of a high power liquid cooled cavity structure, consisting of two low power cavities tuned to frequencies slightly above and slightly below the resonant frequency of the high power structure. Eac... | 01/27/1976 |
