Abstract: A light transmissive, electrically conductive oxide comprising tin and a Group II element is doped with a Group III element and with one or more of hydrogen or fluorine. The oxide may be deposited by sputtering at a temperature in the range from 25.degree. to 350.degree. C., or by chemical vapor deposition at temperatures in the range from 80.degree. to 400.degree. C.

Abstract: The present invention provides magnetic recording media comprising a magnetizable layer and optionally a backside coating provided on a nonmagnetizable substrate. At least one of the magnetizable layer and the optional backside coating comprises a polymeric binder, wherein the polymeric binder is obtained from reactants comprising a free radical generator and a radiation curable polymer. The radiation curable polymer comprises a plurality of radiation curable, .alpha.

Abstract: The present invention provides a hexagonal magnetic ferrite pigment suitable for high density magnetic recording applications. The pigment is characterized by small particle size, a modified magnetoplumbite structure, and relatively high magnetic moment. The pigment is capable of being prepared by firing suitable precursor particles in air at temperatures below 850.degree. C.

Abstract: The present invention concerns a filter system for a helical scanner drum of the type having a drum cover provided with an air vent. The filter system includes a replaceable air filter element for entrapping airborne particles when air is drawn through the filter element and means for removably securing the filter element to the drum cover such that the filter element covers the air vent.

Abstract: The present invention provides a magnetic recording tape cassette comprising: a housing having an access area; two reels, rotatably mounted within the housing; a length of magnetic tape having opposite end portions wound around each of the reels and a portion extending therebetween; a tape guiding surface for guiding the tape portion in extension between the reels, across the access area, and along a predefined path between at least one of the reels and the access area; at least one slack limiting tab having a contact end portion and a mounting region; the slack limiting tab comprising a flexible, resilient polymeric material having a T.sub.g of greater than about 140.degree. C.; and mounting means in said housing for mounting said slack limiting tab in the housing such that the mounting region engages the mounting means, and the contact end portion is biased against the tape to press the tape against the tape guiding surface.

Abstract: According to a process for converting chromium dioxide into chromium (III) oxide, a composite comprising chromium dioxide particles dispersed in an organic matrix is provided. In a first heating step, a feed consisting essentially of the composite is heated under conditions sufficient to convert the feed into an admixture comprising chromium oxide and carbon. In a second heating step, the admixture is heated under conditions such that substantially all of the chromium oxide in the admixture is converted into chromium (III) oxide. In preferred embodiments, the composite is a chromium dioxide-based magnetic recording medium.

Abstract: Beta cobaltous hydroxide is synthesized by decomposing the complex formed between cobaltous ions and a suitable complexing agent under hydrothermal conditions. Cobaltous ion and complexing agent are combined in an aqueous medium, wherein the molar ratio of the cobaltous ion to the complexing agent is about one or more. Hydroxide ion is added, wherein the molar ratio of hydroxide ion to cobaltous ion is more than about 2. The resulting admixture is heated under hydrothermal conditions for precipitating beta cobaltous hydroxide. The method provides improved control over the size and shape of the beta cobaltous hydroxide reaction product. The beta cobaltous hydroxide can be reduced to form magnetic particles of cobalt metal.

Abstract: A method and agent for improving polyurethane binder compositions are provided. The method comprises introducing into the polyurethane backbone a diol residue including a double bond therein. Preferably the double bond is positioned in a moiety pendant from the polyurethane backbone. In preferred compounds, the double bond-containing residue is introduced in sufficient quantities to provide at least one double bond every 2,000-3,000 molecular weight units of polymer. Preferred agents include acrylate-, methacrylate-, acrylamide-, norbornenyl- and cyclohexenyl- groups. Preferred compositions, both cured and uncured, are provided. Also, use of such a composition in magnetic recording media is described.

Abstract: Game apparatus comprises a projectile and a head garment. The head garment includes a head-fitting member configured and dimensioned to be releasably worn on the head of the player. The head garment also includes a visor attached to said head-fitting member, wherein the visor is configured with an aperture of sufficient size to allow said projectile to pass through the aperture.

Abstract: The present invention provides a large area, high pixel density solid state radiation detector with a real-time and a non-destructive read-out. The solid state detector comprises a plurality of field effect transistors deposited onto a substrate to form an array. A planarization layer is deposited over the array of transistors. An energy sensitive layer is deposited onto the planarization layer. Means is provided for electrically connecting the energy sensitive layer with each transistor of the array. A top electrode layer is deposited onto the energy sensitive layer. The solid state detector also comprises circuitry means for providing electronic read-out from each FET of the array.

Abstract: The present invention concerns magnetic recording media comprising fine, magnetizable pigment or particles dispersed within a binder and supported on a substrate. The invention particularly concerns the nature of the binder polymer and its preparation. The binder polymer is a curable polymer comprising a sulfonated, hydroxy-functional polyurethane polymer. A plurality of SO.sub.3 M groups are pendant from the polyurethane polymer backbone. The SO.sub.3 M groups have an equivalent weight of from about 2,000 to about 100,000. M is selected form the group consisting of H.sup.+, Li.sup.+, Na.sup.+, K.sup.+, NR.sub.4.sup.+ where R can be H.sup.+ or an alkyl group, and mixtures thereof. A plurality of hydrophobic polymer chain segments are incorporated into the polyurethane polymer that comprise residues of a polyol having a molecular weight of at least about 180. The hydrophobic chain segments have a carbon atom to polar functionality of at least about 60.

Abstract: An aqueous ferrofluid comprises a plurality of colloidally-dispersed magnetite particles and a dispersing aid. The magnetite particles are coated with an anti-agglomeration agent which is a carboxy-functional polymer.

Abstract: The present invention provides a large area, high pixel density solid state radiation detector with a real-time and a non-destructive read-out. The solid state detector comprises a plurality of field effect transistors deposited onto a substrate to form an array. A planarization layer is deposited over the array of transistors. An energy sensitive layer is deposited onto the planarization layer. Means is provided for electrically connecting the energy sensitive layer with each transistor of the array. A top electrode layer is deposited onto the energy sensitive layer. The solid state detector also comprises circuitry means for providing electronic read-out from each FET of the array.

Abstract: The present invention concerns magnetic recording media comprising fine, magnetizable pigment for particles dispersed within a binder and supported on a substrate. The invention particularly concerns the nature of the binder polymer and its preparation. The binder polymer is a curable polymer comprising a sulfonated, hydroxy-functional polyurethane polymer. A plurality of SO.sub.3 M groups are pendant from the polyurethane polymer backbone. The SO.sub.3 M groups have an equivalent weight of from about 2,000 to about 100,000. M is selected from the group consisting of H.sup.+, Li.sup.+, Na.sup.+, K.sup.+, NR.sub.4.sup.+ where R can be H.sup.+ or an alkyl group, and mixtures thereof. A plurality of hydrophobic polymer chain segments are incorporated into the polyurethane polymer that comprise residues of a polyol having a molecular weight of at least about 180. The hydrophobic chain segments have a carbon atom to polar functionality of at least about 60.

Abstract: The present invention provides a large area, high pixel density solid state radiation detector with a real-time and a non-destructive read-out. The solid state detector comprises a plurality of field effect transistors deposited onto a substrate to form an array. A planarization layer is deposited over the array of transistors. An energy sensitive layer is deposited onto the planarization layer. Means is provided for electrically connecting the energy sensitive layer with each transistor of the array. A top electrode layer is deposited onto the energy sensitive layer. The solid state detector also comprises circuitry means for providing electronic read-out from each FET of the array.

Abstract: A two-layer protective coating covers a metallic thin film magnetic recording medium of a magnetic recording element. The two-layer protective coating comprises a primer layer proximal to the metallic thin film magnetic recording medium. The primer layer comprises an amino functional alkoxy silane and a copolymerizable monomer. The copolymerizable monomer comprises a plurality of vinyl groups. The two-layer protective coating also comprises a lubricant layer distal from the metallic thin film magnetic recording medium. The lubricant layer comprises a functional perfluoropolyether.

Abstract: The present invention concerns perfluoro-based antistatic compositions comprising 0.5 to 5.0 parts by weight of an ionic perfluoro surfactant and 0.5 to 5.0 parts by weight of a nonionic perfluoro surfactant in admixture with 100 parts by weight of nonfluorinated, copolymerizable, radiation curable prepolymers as well as antistatic hard coatings prepared from these compositions. The present invention also concerns optical recording media having such antistatic hard coatings provided on at least one surface.

Abstract: A light transmissive, electrically conductive oxide is doped with a stabilizing gas such as H.sub.2 and H.sub.2 O. The oxide is formed by sputtering a light transmissive, electrically conductive oxide precursor onto a substrate at a temperature from 20.degree. C. to 300.degree. C. Sputtering occurs in a gaseous mixture including a sputtering gas and the stabilizing gas.

Abstract: A skid-resistant, surface marking material is disclosed. The skid-resistant, surface marking material comprises a polymer matrix phase and a plurality of opaque ceramic spheroids partially embedded in and protruding from the top surface of the matrix layer. The ceramic spheroids have rounded surfaces and no substantial points.

Abstract: Stretched surface recording disk (SD) 10 comprises an annular support 12 having raised annular ridges 42 and 28 at its inside and outside diameters 22 and 30 with a base portion 24 in between the two ridges, and an annular recording medium film 14 held in radial tension and stretched across the base portion by adhering the film to attachment surfaces 48 and 36 near the inside and outside diameters respectively. The SD is annealed twice during manufacture to relieve stress in the stretched film 14. This annealing results in SD essentially free from track anisotropy and stress distribution anisotropy in the plane of the disk. As a result, data tracks are more stable than in previous SD, track density can be greater, and the SD is generally more reliable.