A filter comprising a filter case the interior of which is divided by a separator into upper and lower filtration chambers, a compact filter material of a cylindrical shape disposed in said upper filtration chamber so as to define on both outer and inner sides thereof a non-purification chamber communicating with upper suction ports formed at the upper part of said filter case and a purification chamber communicating with a drain pipe disposed on the upper surface of said filter case and having ...

A filter for use in a spectrometer to filter transmitted radiation and wherein the filter has a birefringent element responsive to an applied signal, a first polarizer for polarizing the radiation transmitted by a sample, a second polarizer for polarizing the radiation transmitted by the birefringent element, and wherein the birefringent element has a birefringent member having a first birefringence and the birefringent member being responsive to a force applied thereto to generate an additional...

A filter includes first and second line patterns each having a length substantially equal to 1/2 of the wavelength of a pass-band frequency, and a resonator that is interposed between the first and second line patterns and is coupled therewith so that the first and second line patterns have open stubs in which connection points between input/output terminals and the first and second line patterns appear to be short-circuited when viewed from ends of the first and second line patterns.

A filter having filter openings, which openings vary in cross-section automatically in accordance with an inherent variable of the medium passing there through. The openings can vary in response to the heat of the medium passing through the openings. The openings can include a perforated plate screening the openings and having elements, which shift the plate relative to the openings. The elements can be springs and can include a shape memory alloy.

A filter is provided for beverage machines such as coffee machines. The filter material is a layer of woven or molded polymeric plastic having a mesh size of between about 52 and 70 microns. Filter material is supported by a coarse support grid which in turn is supported by a carrier.

A filter having a plurality of axially aligned and axially spaced flat annular discs of filtering material separated by inner and outer support members alternating axially with the respective discs and providing axial support for the discs while defining radial inlet and outlet openings communicating with the spaces between the discs for the flow of fluid axially through the discs.

A high-voltage resistive filter of through type, using a ceramic dielectric. The filter comprises a cylindrical ceramic dielectric having electrodes formed on respective both end surfaces of said dielectric cylinders, a conductor penetrating through inner space of said cylinder and mounted at an end to one of said electrodes through a connecting metal fixture, a ferrite ring fitted to said conductor, and a chassis fitting metal fixture adhered to the other one of the electrodes. A synthetic resi...

The invention relates to a filter for pipes of the type used for carrying water for industrial uses. The filter has a filter element which comprises a rigid, cylindrically shaped skeleton frame and a sheet material sieve internally of the frame. The sieve is attached only to the top and bottom portions of the frame and has the property such that it is deformable from a slack state to a tensioned state under the effect of fluid pressure. The sieve has restoring properties which cause damped vibra...

A filter for removing impurities from an airstream comprising a housing having filter media holding means operatively attached thereto and a flange portion disposed around said housing, a filter media retainer fixedly attached to said housing, filter media attached in an airtight manner on said flange portion by said holding means, said retainer retaining said media in such a position with respect to the airstream that said filter media forms two coaxial filter pockets of substantially equal dep...

Aerosol filters, particularly cigarette filters, are formed from short synthetic fibers containing a bonding agent by confining a random array of said fibers having an orientation predominantly transverse to the longitudinal axis of said filter in an area having the desired configuration and activating the bonding agent to form a coherent article.