Abstract: A porous article of manufacture (a sealing material) which comprises sintered hydroxyalkylcellulose, for example, sintered hydroxypropylcellulose, or a sealing material which is capable of being formed into a porous article in the form of a filter and which is made by heating at least one gelling agent that has carboxyl functionality and at least one gelling agent that has hydroxyl functionality, preferably carboxylmethylcellulose (CMC) and hydroxypropylcellulose (HPC) respectively, and a method for preparing the same from a powdery admixture thereof, and a pipette which includes the sealing material in the form of a filter, and also including embodiments of a bilayer filter and of a trilayer filter, each of which comprises a composite of a filter of the present invention and a filter comprising porous sintered polyethylene, preferably ultra high-molecular weight polyethylene.

Abstract: A porous article of manufacture (a sealing material) which comprises sintered hydroxyalkylcellulose, for example, sintered hydroxypropylcellulose, or a sealing material which is capable of being formed into a porous article in the form of a filter and which is made by heating at least one gelling agent that has carboxyl functionality and at least one gelling agent that has hydroxyl functionality, preferably carboxylmethylcellulose (CMC) and hydroxypropylcellulose (HPC) respectively, and a method for preparing the same from a powdery admixture thereof, and a pipette which includes the sealing material in the form of a filter, and also including embodiments of a bilayer filter and of a trilayer filter, each of which comprises a composite of a filter of the present invention and a filter comprising porous sintered polyethylene, preferably ultra high-molecular weight polyethylene.

Abstract: Disclosed is a porous filter support plate of the kind used in traveling bridge filters for the support of granular filter media used in the filtration of waste water, industrial liquors or baths, or for filtration of potable water in a water purification system. The support plates are formed of porous, heat-fusible materials, for example, a thermoplastic organic material, joined together by heat-fused butt joints and/or reinforced by vertical zones which extend vertically through the plates in which the material has been brought to a molten state and is pressed together to form a dense, solid, non-porous mass.

Abstract: Disclosed is a porous filter support plate of the kind used in traveling bridge filters for the support of granular filter media used in the filtration of waste water, industrial liquors or baths, or for filtration of potable water in a water purification system. The support plates are formed of porous, heat-fusible materials, for example, a thermoplastic organic material, joined together by heat-fused butt joints and/or reinforced by vertical zones which extend vertically through the plates in which the material has been brought to a molten state and is pressed together to form a dense, solid, non-porous mass.

Abstract: An orthogonally-polarized microstrip patch radiator feed structure comprising a cavity of circular cross section, a microstrip radiation emitter including a first ground plane at the bottom of the cavity, a first non-conductive substrate overlying the first ground plane, a circular conductive transmit patch on the first substrate, and a first input line on the first substrate extending radially to the transmit patch, and a microstrip radiation receiver, including a second non-conducting substrate overlying and spaced from said first substrate, a second ground plane on the inner surface of the second substrate in the form of a first array of spaced parallel conductive bars orthogonal to the radius of the first input line, a circular receive patch on the outer surface of said second substrate in the form of a second array of spaced parallel conductive bars aligned with the bars of the first array, and a second input line of the second substrate connected to the receive patch and extending radially in a directio

Abstract: A mixer especially useful for making mechanical foams is disclosed. The mixer includes a stator and a rotor mounted for rotation with respect to the stator, the stator and rotor defining a fluid flow path between them. The fluid flow path includes two shearing zones spaced axially along the rotor. A surface of the rotor extending from the first shearing zone to the second shearing zone defines one boundary of the fluid flow path. The cross-sectional area of the flow path through the mixer is kept substantially constant, varying by no more than about 25 percent, so that zones of stalled flow and low pressure are avoided, thereby maintaining the velocity of the mixture in the flow path relatively high at all times and maintaining a substantial back pressure on the mixture. Portions of the stator and rotor are easily assemblable or disassemblable so that the mixer can be readily converted from a multi-head form to a single-head form.