Abstract: A test card incorporates a colorimetric indicator test to determine the presence of a minute amount of a specific substance in a liquid medium. The test card includes top and bottom sheets adhesively secured to an intermediate frame member which, together with the top and bottom sheets, defines a filter chamber having a flat filter therein which incorporates a test portion. The test portion of the filter has a binding substrate to which antibodies of the specific substance have been bound. This binding substrate is in communication with a test port. In the method of the invention a substance to be tested is administered through the test port and contains an unknown amount of antigen. After the sample is administered an aqueous solution of enzyme labelled antigen is administered and, subsequently, a liquid substrate is added to cause a color change in the filter below the test port inversely proportional to the amount of antigen contained in the sample administered at the test port.
Abstract: An improved method for producing high temperature superconductors comprising sintering ceramic superconductor material in a sealed confinement chamber made of non-reactive impervious material, thereby preventing loss of oxygen from the material during heating and eliminating the need for reoxygenation after sintering.
March 13, 1989
Date of Patent:
May 19, 1992
Southwest Research Institute
Martin J. Sablik, Colin I. Nicholls, Robert E. Anderson
Abstract: A method of forming a plastic sealing plate for a compressor valve. A center gated mold is employed in conjunction with a heated barrel which encloses a reciprocating screw for feeding plastic through an injector into the mold. Polyetheretherketone polymer pellets are heated to about 150.degree. C. to remove moisture after which they are fed into and through the heated barrel, the heated barrel being elevated to a temperature in the range of 350.degree.-380.degree. C. for melting the pellets. The mold is heated to a temperature in the range of 150.degree.-180.degree. C. The melted polymer is then injected into the mold by the reciprocating screw to obtain proper mixing and pressurizing, after which the mold is heated to a temperature of about 300.degree. C. to anneal the plastic in the mold and to expand the polymer to fill the entire mold and relieve stress in the material.
Abstract: A laparoscopic cauterization electrode for connection to a source of appropriate electrical power for performing deep surgical operations through an opening in a body such as deep thorax, abdominal perineal, deep rectum, deep gynecological and similar deep body operations, comprising an electrically conductive electrode shaft of a width sized for insertion through the body opening having a proximal and a distal end, the proximal the of said electrode adapted for electrical connectivity to the power source and the distal end having teflon-coated operative tip associated therewith, insulation for providing both electrical and thermal insulation and abrasion resistance along the electrode shaft between the proximal and distal ends of the electrode and the electrode shaft being of a sufficient length to extend from the exterior into the interior of a body for performing the deep surgical operations.
Abstract: New cation-active amine compositions, liquid at ambient temperature, which do not form concretions by prolonged maintenance at temperatures in the region of 0.degree. C., nor by exposure to the open air, and which do not contain solvents, comprising from 20 to 80% branched-chain alkyletheramines and 80 to 20% oxyalkylated alkylpolyamines. Application of their acid liquid solutions as emulsifying phases of road bitumen, and improved manufacturing process for road bitumen emulsions.
November 16, 1989
Date of Patent:
March 24, 1992
Rene L. A. Brouard, Luc E. A. Navascues
Abstract: A hardenable, fluorinated copolymer of fluorinated monomers and a hydroxylated and/or epoxidized allyl ether, paints and varnishes comprising such copolymers, and the process of making such copolymer.
Abstract: An oligomer of the formula ##STR1## in which R.sub.1 =H or CH.sub.3 ;R.sub.2 =C.sub.t H.sub.2t in whcih 0.ltoreq.t.ltoreq.18;Z is selected from C.sub.2 H.sub.4, C2H2 and ##STR2## in which 2.ltoreq.d.ltoreq.16; m is an integer such that 1.ltoreq.m.ltoreq.3;R.sub.3 =C.sub.t'H.sub.2t'+1 in which t'.gtoreq.1 and 8.ltoreq.t+t'+2m.ltoreq.22n and n' are identical or different integers, such that 2.ltoreq.n+n'.ltoreq.20;b is an integer equal to 0 or 1; anda is an integer ranging from 2 to 500.The invention also comprises the method of making the oligomer and thermoplastic films containing the same as well as the resultant thermoplastic films.
August 15, 1990
Date of Patent:
February 18, 1992
Roland Parsy, Daniel Augustin, Christian Collette
Abstract: An improved prosthesis holder for retaining a prosthesis in the desired position with respect to the femoral canal of a femur during surgery. The holder comprises a holding unit member specially adapted for positioning in cooperative association with the neck of the prosthesis so as to provide improved holding, protective and positioning characteristics to the holder.
Abstract: An improvement in the method and apparatus for transversely folding a continuous tubular sleeve. The sleeve is unwound onto a plurality of movable conformators mounted on a rotatable platen which supports the folded sleeve segments. After the desired amount of concentric folds are formed, the platen and conformators are rotated essentially 90.degree. to bring the folded segment into a horizontal plane for extraction. Also disclosed is a mobile device for performing the extraction of the folded sheath segment.
Abstract: A refractory composition for forming shaped refractories comprising from about 60 to 85% by weight of a dead-burned magnesite and, correspondingly, about 15 to 40% by weight of a magnesia-alumina spinel grain; said refractory having a total lime and silica content of about 2 to 4% by weight and a lime-to-silica ratio (CaO:SiO.sub.2) greater than about 1.
Abstract: A polyvinylidene fluoride product having at least one surface with improved adhesion to an incompatible polymer, said at least one surface covered with a porous polyvinylidene fluoride layer adhered thereto without a bonding intermediate, the process of forming the polyvinylidene fluoride product, and laminates thereof with non-adherent polymers.
Abstract: A composition capable of preserving moisture-containing agriculture products succeptible to mold spoilage from mold spoilage for an extended period of time comprising a mold-inhibiting agent, a quaternary ammonium compound, and a polyglycol and the method of preserving agricultural products utilizing the composition.
Abstract: A fingerprinting system comprising means capable of releasably retaining a liquid and a liquid composition releasably retained in said means, said liquid composition comprising a leuco chromogenic compound and an oleophilic solvent therefor, and a substrate for receiving fingerprints associated therewith, said substrate being coated on at least a portion of one surface thereof with a color-developing substance capable of reacting with said chromogenic compound to produce a colored reaction product. The invention also comprises the method of fingerprinting utilizing such system.
Abstract: A slide gate assembly for use with a metal-working vessel comprising at least one stationary refractory plate and at least one sliding refractory plate slidably engaged with said stationary plate, said refractory plates each having at least one passage therethrough and spaced in relation to each other such that said sliding refractory plate can be moved to bring its passage into and out of alignment with the passage of said at least one stationary plate to effect discharge or retention of molten metal in said metal-working vessel; at least a portion of each of said refractory plates consisting essentially of an unburned high-strength carbon-bonded magnesite refractory containing at least about 5% by weight carbon and at least about 74% by weight magnesite.
Abstract: A composition consisting essentially of a polyvinylidene fluoride polymer or copolymer having distributed substantially uniformly therethrough elastomeric particles, said elastomer being capable of absorbing hydrocarbons and fixing them in the composition and being present in an amount sufficient to increase the elongation and flexibility of the composition in the presence of hydrocarbons and shaped articles made therefrom.
Abstract: An encapsulated food product consisting essentially of a solid comestible completely coated with a substantially uniform outer shell of an edible polymer of a type and of a thickness sufficient to prevent the diffusion of flavor and/or color elements from said comestible into a liquid medium or from said liquid medium into said coated comestible, canned or bottled food products containing the same, and the method of making such products.
Abstract: A rebonded, fused brick resulting from burning a mix consisting essentially of a fused magnesite chrome grain, a fused chrome-magnesite grain or mixtures thereof, and a chrome ore having a Cr.sub.2 O.sub.3 /(Al.sub.2 O.sub.3 +Fe.sub.2 O.sub.3) ratio of at least about 1.15, a maximum silica content of about 3.85, and an Fe.sub.2 O.sub.3 content of less than about 25% by weight.
Abstract: A hand-held aspirating device comprising a main housing having a handle and a barrel, said barrel having a front end and a rear portion, said handle having a lower end and an upper end communicating with said rear portion of said barrel; actuating means extending from said main housing beneath said barrel, means operatively associated with said actuating means to normally maintain said actuating means in an extended position, said actuating means being actuable in a direction generally parallel to said barrel to move said actuating means rearwardly toward said handle; suction means including a suction chamber disposed within said housing and responsive to the actuation of said actuating means for creating a suction within said suction chamber; a container means for receiving aspirate, said container means being removably connected to said handle; a first conduit within said housing, said first conduit having two ends, one of said ends normally being in fluid-flow communication with said container means and th
Abstract: A tundish consisting essentially of a rigid metallic outer casing having walls and a bottom at least one permanent layer of heat insulating material adjacent said casing, and a unitary, integrally formed expendable inner lining made of a hydrocarbon-free refractory composition and having at least one liquid metal flow control device integrally formed therewith, the lining being chemically compatible with the molten metal to be placed in the tundish. The invention also comprises the unitary integrally formed expendable lining and the method to form the same.