Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 7348869 | Adjustable coaxial filter device with axially adjustable inner conductor An adjustable filter includes an outer conductor, a first inner conductor, and a second inner conductor. The inner conductors are capacitively coupled on the same axis. The further may further include a third inner conductor capacitively coupled to both the first an... | 03/25/2008 |
| 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 |
| 6133810 | Enhanced coaxial cavity filter configured to be tunable while shorted An enhanced tunable coaxial cavity filter that may be tuned while it is shorted. The coaxial cavity filter may have one or more cavities. One or more of the cavities may include a switch for shorting the cavity. When a plurality of cavities are implemente... | 10/17/2000 |
| 5978199 | EMP-charge-eliminator An EMP-eliminator is to be created which is simultaneously applicable for multiple frequency bands and highest frequencies and at the same time allows transmission of AC/DC supply voltages. For this purpose a casing (20) set in an outer line (10) is provi... | 11/02/1999 |
| 4933652 | Tem coaxial resonator A coaxial resonance cavity of either the fingered or unfingered variety having a metal heat conducting barbell shaped structure inside the movable tuning plunger to conduct heat from the inner surface of the movable plunger to the inner surface of the fix... | 06/12/1990 |
| 4568898 | Short-circuit device A coaxial short-circuit device has an inner conductor which is surrounded by an outer conductor and is electrically connected to the latter by a shorting plunger. In order to allow the axial movement of the shorting plunger, the inner conductor accommodat... | 02/04/1986 |
| 4472695 | Band pass filter tunable to a predetermined number of discrete frequencies spread over a broad frequency band Coaxial filter having at least one of the internal and external conductors which is divided into sections (S1 to S4) separated by breaks having to form of annular slits whose thickness is very slight in relation to the wavelength. Ea... | 09/18/1984 |
| 4303899 | Matched high Q, high frequency resonators The resonator is formed with a primary line which is slightly less than a ltiple of a half wavelength long, a tee, and a matching stub. The primary line and the stub are adjustable to make the total length a multiple of one half wavelength. A mechanical l... | 12/01/1981 |
| 4207548 | Tuned circuits A coaxial resonator is provided having an outer conductor with top and bottom closures and a substantially central opening through the top closure through which a tubular member forming a center conductor extends. The center conductor also comprises a plu... | 06/10/1980 |
| 4096453 | Double-mode tuned microwave oscillator The embedding network of a microwave oscillator comprises three lengths of parallel conductors supported above a ground plane and having odd and even mode short circuits thereon. Two of the conductors are connected to different ones of the electrodes of a... | 06/20/1978 |
| 4034320 | High power coaxial cavity resonator tunable over a broad band of frequencies An output coaxial cavity for high power electron tubes is described in which the output coupler is directly connected to an intermediate coaxial conductor of the coaxial cavity at a distance from the tube that is greater than one-quarter wavelength and le... | 07/05/1977 |
