Abstract: Device for oral administration of a medicament to a ruminant animal comprises a rilaminate sheet (1) containing the medicament rolled into a tube retained in the rolled configuration by a film (3) of material which disintegrates in the rumen to allow unrolling of the sheet. The tube ends are closed by plugs (2) which keep the tube closed during passage of the device through the oesophagus.

Abstract: Compounds of the formula ##STR1## wherein A is a carbocyclic, saturated or unsaturated ring; R.sup.1 is hydrogen or alkyl; R and R.sup.4 are each alkyl, cycloalkyl, benzyl or a readily hydrolyzable ester group; Y is a bond or a straight or branch alkylene; R.sup.2 is hydrogen, aryl, heterocyclic, R.sup.6 CONR.sup.5, R.sup.7 NR.sup.5 CO, R.sup.7 NR.sup.5 SO.sub.2 --or R.sup.8 SO.sub.2 NR.sup.5 --where R.sup.5 is hydrogen, alkyl or aralkyl; R.sup.6 is alkyl, aryl, aralkyl, heterocyclic, heterocyclyalkyl or a group of the formula ##STR2## where R.sup.9 is hydrogen, hydroxy, alkoxy, alkyl, hydroxyalkyl, aralkyl, alkylene, heterocyclic, heterocyclylalkyl, R.sup.12 CONH--, R.sup.12 SO.sub.2 NH-- or (R.sup.13).sub.2 N--; R.sup.10 and R.sup.11 are each hydrogen or alkyl; or R.sup.10 is hydrogen and R.sup.11 is aminoalkyl, imidazolylmethyl, aryl, aralkyl, aralkoxyalkoxy, hydroxyalkyl or methylthioalkyl; or R.sup.10 and R.sup.

Abstract: An infrared burner with an extremely low pressure drop is described. The burner comprises a corrosion resistant mesh screen having a thick porous coating of ceramic fibers deposited thereon. In addition to a low pressure drop the burner has structural integrity and ability to generate radiant energy at a high rate. The burner is produced by admixing alumina and ceramic fibers with a clathrate-forming halocarbon material which is removed upon drying.

Abstract: A high solids, stable, nonaqueous dispersion, comprising a low Tg copolymer, having a Tg between about -10.degree. C. and about 30.degree. C., particularly adapted for use as a clear coat automotive finish. The copolymer is the copolymerization product of monomers whose Tg is above about 50.degree. C., polar monomers whose Tg is up to about 15.degree. C. and .alpha., .beta. ethylenically unsaturated stabilizer copolymers. The stabilizer copolymers are formed from .alpha., .beta. ethylenically unsaturated monomers and at least one oxirane containing compound and have a molecular weight of about 2,000 to about 25,000, are soluble in aliphatic solvents and have a Tg of about -60.degree. C. to about 0.degree. C. These nonaqueous dispersions result in coatings having high % solids, ease of application, minimal sagging and good gloss and DOI. They are preferably made by copolymerizing ethylenically unsaturated monomers with about 0.

Abstract: Barriers used for separating silicone pressurizing medium from articles during curing, thereby protecting the article from silicone contamination. A composite precursor is substantially encapsulated by a barrier coating that is capable of substantially separating the composite precursor from silicone polymers at elevated temperatures during curing. The barrier coating is also capable of being chemically removed from the composite precursor subsequent to its cure without substantially damaging the composite. Composites are molded by protecting a composite precursor from a silicone pressurizing medium during curing utilizing a barrier coating. The method comprises encapsulating a composite precursor with a coating that is substantially capable of separating the composite precursor from silicone polymers at elevated temperatures. The coating is also capable of being chemically removed from the composite without damaging the composite.

Abstract: A method for manufacturing a discontinuous fiber reinforced glass matrix composites by injection molding using an injection nozzle that separates substantially all of a multifilament yarn into individual fibers resulting in a composite having greater crack resistance. The method comprises impregnating continuous filament yarn with glass matrix powders comprising glass, glass-ceramic powders or a mixture thereof. The impregnated multifilament yarn is chopped into discontinuous lengths and exposed to a temperature sufficient so that the matrix material softens. Pressure is applied to the heated impregnated multifilament yarn sufficient to displace the yarn into a mold through an injection nozzle contoured such that sufficient die-wall shear forces are generated to separate substantially all of the multifilament yarn into individual filaments. A mold pressure is maintained sufficient to prevent relaxation of the composite until the strain point of the glass is reached.

Abstract: A flowable particulate polymer-metal mixture that is thermally conductive and is particularly adapted for use as a pressurizing medium in a high pressure elevated temperature molding process. The material comprises a substantially uniform mixture of about 20% to about 90% solid flowable, particulate silicone rubber having a nominal flow rate of at least 0.6 gram/second through a 1.1 cm diameter pipe 7.6 cm long under applied pressure of 10.34 MPa at room temperature. The material also comprises about 10% to about 80% thermally conductive particulate metal that has a melting point less than the molding temperature and is substantially chemically compatible with said silicone rubber. The pressurizing medium is used to mold article precursors into articles by placing an article precursor within a pressure vessel and substantially filling the vessel with a pressurizing mixture.

Abstract: A method particularly adapted for making a complex shaped composite component that has reduced bridging defects. The method comprises disposing a composite prepreg on to a substantially flat tool. The composite prepreg has a substantially flat section and at least one prepreg member extending from and substantially perpendicular to said flat section. A layer, at least about 125% of said composite prepreg height, of a said flowable particulate silicone rubber is disposed in substantially complete contact with the composite prepreg surface. The particulate silicone rubber has a flow rate of at least 0.6 gram/second through a 1.1 cm diameter pipe 7.6 cm long under applied pressure of 10.34 MPa at room temperature. The layer of solid flowable rubber is covered with a bag to effect a gas tight seal. The bag is exposed to pressures which are transferred to said prepreg by said solid flowable polymer. The composite prepreg is exposed to temperatures to form a composite component.

Abstract: A multilayered electronics protection system includes a first ablator layer providing thermal protection that is sprayed on to a non-metallic surface of an electronics enclosure. A second ablator layer comprised of highly conductive material is sprayed on to the first ablator layer and provides protection against strategic environmental threats.

Abstract: High temperature fluorinated polyimides having repeating polymer units of the formula ##STR1## wherein X is aromatic or aliphatic. The polyimides can be made by oxidizing 1-phenyl-1,1-bis (3,4-xylyl)-2,2,2-trifluorethane to form 4,4'(2,2,2-trifluoro-1-phenylethylidene)biphthalic tetra carboxylic acid and dehydrating that to form 4,4'(2,2,2-trifluoro-1-phenyl-ethylidene-biphthalic tetra carboxylic acid dianhydride. The dianhydride is polymerized with a diamine to form a polyamic acid which is further imidized to the polyimide. Alternatively, the dianhydride can be esterified to form a 4,4'(2,2,2-trifluoro-1-phenylethylidene)-biphthalic tetracarboxylic acid dialkylester which is then polymerized with a diamine to form a polyamic acid which can then be imidized to a polyimide.

Abstract: A mixing arrangement (113) for mixing volatile materials (118, 119) in a mixing container (114), including mixing blades (118, 119) and a drive mechanism (117), at least one of said blades (118, 119) holding a temperature detection arrangement (250) effective for detecting bulk temperature levels in said materials during mixing operation and thereby enabling control of the velocity of the mixing blades (118, 119) in the materials being mixed, said temperature detection arrangement being effective for external communication of information developed during detection operation.

Abstract: A chemical pump system that utilizes a self-driven compressor to increase the system pressure while obviating the need for a one-way valve and liquid head to provide the driving force for the reactants, thus enhancing long distance transport. The system comprises a chemical heat pipe employing reversible endothermic/exothermic chemical reactions to transfer thermal energy between a heat source and a heat sink. At least one reactant is self-driven substantially unidirectionally through the heat pipe by compressing the reactant(s) with a compressor and heating the reactant(s) to a predetermined pressure and temperature sufficient to form a reaction product having at least a 150% molar increase. The reaction product is expanded with an expander that is linked mechanically to the compressor. The expansion energy is sufficient to compress the reactants to the predetermined pressure while maintaining the self-driven unidirectional flow.

Abstract: Molten carbonate fuel cell cathodes formed from a composition comprising oxides of nickel, lithium salts and barium salts having improved strength. These cathodes are fabricated by prefiring oxides of nickel and optionally lithium salts. The prefired powder is optionally leached with an organic acid and optional barium salts may be added. These powders are formed into an electrode and sintered. The resulting electrodes have improved strength.

Abstract: A method of fabricating a fiber reinforced resin composite article having tubular structures that has improved density and fewer voids. The method comprises laying up a prepreg that has at least two tubular structures and disposing a thermally conductive metallic support structure within and in contact with the tubular structures. The prepreg is disposed within and in substantially complete contact with a tool which has at least one hole. An expandable bag having at least one opening in communication with a tube is inserted within each tubular structure thereby forming a void space between the bag and the tubular structure. The void space is substantially filled with a solid flowable particulate silicone rubber that contacts the prepreg and the tube is sealed to edge of hole in the tool. The solid flowable rubber is caused to transfer a substantially uniform predetermined pressure to the surface of the prepreg by pressurizing the expandable bag.

Abstract: A filament wound fiber reinforced resin matrix composite structure. The structure is particularly adapted for use as a torque drive diaphragm in a rotary wing aircraft hub. The structure comprises a substantially flat diaphragm and a rim. The diaphragm has a central hole therethrough for receiving a shaft and the rim has an inward turning flange for attachment. The diaphragm has an attachment means surrounding the central hole. An alternative embodiment of the structure is a hollow disc having first and second substantially flat diaphragm sides with a rim. The sides have concentric central holes therethrough and attachment means surround the holes. The structure comprises a resin matrix, fibers wound substantially tangentially to the central hole with sufficient tension in a multiple circuit pattern to form the structure, and fibers wound with sufficient tension in an essentially circumferential manner to reinforce the rim of the structure.

Abstract: A filament wound fiber reinforced resin matrix composite structure. The structure is particularly adapted for use as a torque drive diaphragm in a rotary wing aircraft hub. The structure comprises a substantially flat diaphragm, a rim, rim reinforcement fibers and at least one fiber reinforcement ring. The diaphragm has a central attachment means for receiving a shaft and the rim has an attachment means. An alternative embodiment of the structure is a hollow disc having first and second substantially flat diaphragm sides with a connecting rim, rim reinforcement fibers and at least one fiber reinforcing ring for each diaphragm side. The sides have centrally located attachment means.

Abstract: Aircraft composite components having foam cores comprising at least two foam sheets joined with a sheet of honeycomb to form a foam-honeycomb-foam sandwich. The layers of sheet foam are in contact with each other and the honeycomb cells extend a substantially equal depth into and generally perpendicular to the sheet foam layers. The composite component has increased shear strength. The aircraft composite component can be made by aligning a layer of honeycomb between and generally perpendicular to two layers of sheet foam. A compressive force is applied generally perpendicular to at least one layer of sheet foam so that the honeycomb cells penetrate each of the two layers of sheet foam to a substantially equal depth so that the layers of foam contact each other to form a foam-honeycomb-foam sandwich. The foam core is surrounded by resin impregnated fibers and cured.

Abstract: A shrinkable foam mandrel that can be easily removed and composite resin transfer molding process that uses the foam mandrel. The foam is dimensionally stable at a first temperature that typically corresponds to the cure temperature of the composite resin. The foam is capable of irreversibly shrinking to less than about 0.5 said foam's original size at a second tempertaure that is above said first tempertaure. The foam is encapsulated by a non-stick elastomer skin and covered with fibers. The fiber covered elastomer encapsulated foam is disposed in a female mold cavity and resin is injected into the female mold cavity. The resin and fibers are cured and the resulting composite component is removed from the female mold. The temperature is raised to the second temperature and the elastomer encapsulated foam male mandrel irreversibly shrink to less than about 0.5 its original size. Finally the shrunken male mandrel is removed from said composite component.

Abstract: An amorphous hydrated metal oxide primer for fibers incorporated into fiber reinforced polymeric matrix composites result in composites having wet strength retention. The layer of amorphous hydrated metal oxide is formed by depositing on the fiber and subsequent hydrolysis of a layer of M.sub.x OR.sub.y where x is 1, y is 3 or 4, M is any metal capable of forming a stable alkoxide and R is an organic radical. Fiber reinforced polymeric matrix composites are preferably made by applying a layer of M.sub.x OR.sub.y to the fiber where x is 1, y is 3 or 4, M is any metal capable of forming a stable alkoxide and R is an organic radical. The fiber having a layer of metal alkoxide is exposed to moisture and a temperature of about 25.degree. C. to about 125.degree. C., impregnated with a resin and stacked in a mold. The stacked impregnated fibers are then pressed with optional heat resulting in a composite having wet strength retention.

Abstract: Gas turbine engine carbon-carbon composite components having multilayer coatings resulting in components resistant to oxidation at temperatures greater than 2500.degree. F. A first multilayer coating comprises a pack derived silicon carbide coating covered with a chemical vapor deposition layer of silicon nitride. A second multilayer coating comprises a layer of pyrolytic graphite covered with a pack derived silicon carbide coating covered with a chemical vapor deposition layer of silicon nitride. The third multilayer coating comprises a layer of chemical vapor deposition applied silicon carbide covered with a pack derived silicon carbide coating covered with a chemical vapor deposition layer of silicon nitride.