Showing papers by "3M published in 1983"

Tibial osteotomy guide assembly and method

Abstract: A method and guide assembly for use in a tibial osteotomy wherein two pairs of parallel guide pins are inserted into the tibia at a predetermined angle with respect to each other through a guide block. The adjacent surfaces of the pairs of pins are then used to precisely guide a saw by which a wedge-shaped segment of the tibia is removed.

Static mixing device

Abstract: A multiple-barreled resin dispensing device having a syringe, an exit conduit, a static mixing element, means for detachably coupling the inlet of the exit conduit to the outlet end of the syringe, and means for locating the static mixing element within the exit conduit to provide rotational alignment of the static mixing element relative to the syringe.

Energy polymerizable compositions containing organometallic initiators

Abstract: An energy polymerizable composition and process therefore, comprising a cationically polymerizable material and a catalytically effective amount of an ionic salt of an organometallic complex cation as polymerization initiator, said ionic salt of an organometallic complex cation being capable of adding an intermediate strength nucleophile or upon photolysis capable of liberating at least one coordination site, said metal in said organometallic complex cation being selected from elements of Periodic Groups IVB, VB, VIB, VIIB, and VIIIB are disclosed. Certain of the organometallic metallic polymerization initiators are novel cationic salts.

Conductive adhesive and biomedical electrode

Abstract: A disposable biomedical electrode is disclosed wherein the electrically-conductive material between the electrode plate and the skin comprises a swellable, conformable, cohesive, hydrophilic, electrically-conductive adhesive formed by an improved solventless process. The adhesive precursor comprises a polyhydric alcohol, a non-ionic unsaturated free radically polymerizable material, a free radical initiator, a crosslinking agent and an ionizable salt. The adhesive precursor is polymerized after coating onto the electrode plate or releasable transfer sheet, preferably by exposure to ultraviolet radiation.

Low surface energy liner of perfluoropolyether

Abstract: Low surface energy liner provided by segments of a perfluoropolyether monomer which has been in- situ-polymerized into a cohesive network which is adhered to a substrate. The low surface energy liner is especially useful as a low-adhesion backsize coating for a pressure-sensitive adhesive tape.

Proppant for well fractures and method of making same

Abstract: The novel proppant consists of composite particles, the core of which is a conventional proppant particle such as silica sand The core has a thin, void-containing coating which provides an overall density approaching that of the fracturing fluid The coating preferably comprises hollow glass microspheres embedded in an adhesive which bonds the microspheres to the core

Articles containing non-fused aluminum oxide-based abrasive mineral

Abstract: The invention relates to synthetic, non-fused, aluminum oxide-based abrasive mineral having a microcrystalline structure of randomly oriented crystallites comprising a dominant continuous phase of α-alumina and a secondary phase, to a method of making the same employing chemical ceramic technology, and to abrasive articles made with the abrasive mineral.

Radiation activated addition reaction

Abstract: A process for the addition of compounds containing silicon-bonded hydrogen to compounds containing aliphatic unsaturation. The process is activated by actinic radiation and is conducted in the presence of a platinum complex having an ultraviolet displaceable group.

Coated ophthalmic lenses and method for coating the same

Abstract: An ophthalmic lens and a method for providing a thin coating thereon is disclosed. The coatings render the surfaces of the devices resistant to abrasion and have an SEB abrasion resistance of at least 20 psi. They are optically clear, aberration-free, and provide essentially exactly an optical surface having the desired surface configuration. The coating compositions employed contain reactive ethylenically unsaturated groups and are applied to a mold face and partially reacted. The coated mold is then used to cast the ophthalmic device.

Glass bubbles of increased collapse strength

Abstract: Glass bubbles of increased collapse strength are prepared. The bubbles have an average particle density of 0.4 or more and are made of glass that consists essentially of SiO 2 (60-90 weight-percent), alkali metal oxide (2-20 weight-percent), B 2 O 3 (1-30 weight-percent), sulfur (0.005 to 0.5 weight-percent), and other conventional glass-forming ingredients.

Fixing of tetra(hydrocarbyl)borate salt imaging systems

Abstract: FIXING OF TETRA (HYDROCARBYL) BORATE SALT IMAGING SYSTEMS Abstract It is highly desirable to have light sensitive imaging systems which do not use expensive silver materials in their construction, yet still have some of the properties of silver imaging systems such as their ability to be fixed. Light sensitive systems using tetra(hydrocarbyl) borates are easily constructed and do not require expen-sive materials therein. It has been found that the borates may be fixed by converting the tetra(hydrocarbyl) borate to a compound which does not have four carbon-to-boron bonds.

Dispersed imaging systems with tetra (hydrocarbyl) borate salts

Abstract: Light sensitive systems comprising a tetra (hydrocarbyl) borate and a dye may be used in the form of a dispersion, with the light sensitive borate and dye in one phase which is dispersed within a second phase.

Fragrance-releasing pull-apart sheet

Abstract: Microencapsulated materials are released by rupturing of an adhesive layer on a substrate containing the capsules.

Composite decorative article

Abstract: A multilayer decorative article having in order an ink-receptive vinyl film layer, a plasticizer barrier layer, and a pressure-sensitive adhesive layer, the adhesive layer being adapted to maintain adhesion to highly plasticized vinyl substrates, and the intermediate barrier layer being capable of preventing plasticizer from migrating from the vinyl substrate into the vinyl film outer layer.

Strip material with heat-formed hooked heads

Abstract: In an elongate strip material which can be severed into lengths to form at least a part of a fastener. The strip material comprises a backing and a multiplicity of lengths of polymeric monofilament having cross sections defining a plurality of radially projecting lobes, each length including a central bight portion secured in the backing, and two stem portions extending from opposite ends of the bight portion and projecting away from the backing. Enlarged heads are formed by heat at the ends of the stem portions opposite the backings, and the heads include hook-like portions spaced from the stem portions and projecting along the stem portions toward the backing that result from heating the ends of the monofilaments because of their lobed cross sections.

Sustained release oral medicinal delivery device

Abstract: A flexible, sheet-like, sustained release medicament device for orally administering a predetermined selective dose of a medicament and a method of preparing the device is disclosed The device is of a multilayer composite construction comprising (a) at least one carrier film comprising at least one water-insoluble polymer and containing medicament, and (b) at least one barrier film overlaying said carrier film on at least one surface thereof and sealed to said carrier film along its periphery and in such a way as to entrap small quantities of air between said carrier and barrier films, said barrier film comprising at least one water-insoluble and water- and medicament-permeable polymer or copolymer, said multilayer composite construction having a bulk density of less than 10 g/cc, so as to render the sustained release medicament device buoyant in the gastric juices of the stomach, and being facilely divisible into any desired length

Adjustment device for an articulated joint brace

Abstract: Two substantially planar discs sandwich pivoting joint elements therebetween. Slides, also between the discs, can move independently in a wide range of angular positions about the pivoting axis of the joint, and be fixed in any selected positions. Slides comprise two elements drawn together radially to clamp onto circumferential rims provided on the discs. Joint bending in each direction is independently controlled. Internal opposed teeth on the disc rims and slides engage when the slides are positioned.

Ophthalmic device comprising a polymer of a telechelic perfluoropolyether

Abstract: Ophthalmic devices, such as contact lenses, of polymers of telechelic perfluorinated polyether monomers, and compositions for making such devices are disclosed. The devices possess improved oxygen permeability.

Vibration-damping constrained-layer constructions

Abstract: A constrained-layer construction comprising a stiff layer or substrate and a layer of a viscoelastic polymer which is the reaction product of (a) 25 to 75 weight percent of an acryloyl or methacryloyl derivative of at least one oligomer, said oligomer having a glass transition temperature of less than 25° C. and a molecular weight per oligomer of 600 to 20,000, and (b) 75 to 25 weight percent of a copolymerizable monomer whose homopolymer has a glass transition temperature of at least 50° C., the copolymer being suitable for damping vibrations at relatively high temperatures, e.g., 50°-150° C., is disclosed. Also included is a process for damping vibrations in component parts of devices used in automotive, aerospace, and computer industries.

Aqueous skin cleaner composition comprising propylene carbonate

Abstract: Composition suitable for removing paint, grease, dirt and other foreign materials from the skin. The composition comprises propylene carbonate, water, at least one organic cosolvent, at least one thickening agent, at least one neutralizing agent, and at least one surfactant. In a preferred embodiment, the composition further includes a mild abrasive, wood flour, to promote the cleaning action of the propylene carbonate.

Intumescent sheet material containing low density fillers

Abstract: Flexible intumescent sheet materials containing low-density filler components in addition to unexpanded vermiculite flakes, inorganic fibrous material and a binder, which provide low-density mounting mats which reduce the mount density to prevent ceramic diesel particulate monolith cracking.

Stack of sheet material

Abstract: A stack of flexible sheet material for use in a dispensing device for dispensing individual sheets. The sheets are stacked with alternately opposite edges of successive sheets coated along one edge with a narrow band of readily releasable repositionable pressure-sensitive adhesive. The dispenser comprises a container having a pair of sidewalls connected by a top wall which is formed with a transversely extending rectangular opening extending in the direction parallel to the sidewalls. The stack of sheets are placed within the dispenser such that upon removing the uppermost sheet in the stack the adhesive coating along one edge of the sheet parallel to the opening and adhered to the free edge of the next sheet in the stack will cause the next sheet in the stack to be withdrawn at that free edge through the dispensing opening upon withdrawal of the adhesive coated edge of the uppermost sheet.

Ear canal electrode

Abstract: A non-invasive, external ear canal electrode useful for transmitting sound stimulus to an ear canal and for conducting electrical signals picked up from the ear canal epidermal surface including a tube comprising electroconductive metal and having a resilient plastic foam element impregnated with an electrolytically conductive medium attached to the end to be placed in the ear.

Method for forming a peripheral edge on contact lenses

Abstract: A method of forming edges on contact lenses prepared from laser-machinable, organic polymers wherein the edge is formed by contacting the lens with a laser beam having a wavelength which is absorbed by the polymer. The radiated energy supplied to the polymer by the laser beam is such that the ratio of heat absorbed in vaporization of the polymer to heat absorbed by the polymer bulk is maximized.

Curable substituted urethane acrylates

Abstract: A class of substituted urethane acrylates and methacrylates having an aliphatic backbone is provided, the members of the class having at least one ether or polyether group with at least one pendent fluorinated organic group attached thereto. The novel compositions may be radiation polymerized, e.g., by electron beam, actinic light or heat, to a light transmissive material which is well suited to optical application, such as coupling optical fibers and light emitting diodes so as to transmit light therebetween.

Infiltrated molded articles of spherical non-refractory metal powders

Abstract: A molded, non-refractory metal article is made by molding in a flexible mold a plastic mixture of non-refractory, spherical metal powders and a heat-fugitive binder comprising thermoplastic material to form a green article of predetermined shape and dimensions, heating the green article to remove said binder and consolidate the non-refractory spherical powders in the form of a porous, monolithic skeleton of necked particles of non-refractory metal, infiltrating the skeleton with a molten metal having a melting point that is at least 25° C. less than the melting point of the lowest melting of said spherical, non-refractory metal particles, and cooling the infiltrated skeleton thereby forming a homogeneous, void-free, non-refractory metal article of two intermeshed metal matrices.

Protective covering for magnetic recording medium

Abstract: Magnetic recording medium protected by an ultra-thin, composite low surface energy covering provided by an inner layer of insoluble polymer and an outer layer of insoluble polymer which are made by in situ polymerization. The inner layer is made from two monomers such as a hydantoin hexacrylate and alpha-methyl styrene. The outer layer is made from polymerizable perfluoropolyether monomer having ethylenicaly unsaturated polymerizable groups. The composite low surface energy covering is especially useful for providing lubricity and corrosion resistance to a metallic thin-film magnetic recording coating.

Torque preloaded elastic cover for torque coupling

Abstract: Une couverture elastique pour accouplements ou epissages consiste en une couverture elastique etendue radialement et torsadee axialement, soutenue sur un noyau de materiau polymere enroule en spirale qui est enleve progressivement de l'interieur de l'organe de couverture sous la forme d'un ruban etroit et continu. A resilient cover for coupling or splicing is a resilient and radially twisted coverage axially supported on a spiral wound core of polymeric material which is progressively removed from the inside of the cover member in the form of a narrow ribbon and continuous.

Peristaltic pumping method and apparatus

Abstract: A peristaltic pump in which fluid is displaced towards the outlet of the pump by a rotating member which engages a section of tubing. The tubing comprises an outer tubing and an inner tubing with an annular airspace maintained therebetween and vented to atmosphere. When a positive hydrostatic head is maintained above the pump head level, the inner tubing will expand and fill. When the fluid level drops below the pump head level, the inner tube collapses, closing off the tube so there is no fluid volume to displace and the pump output stops to prevent entrainment of air into the patient's circulation. An occluding valve having a normlly closed position may also be provided at the inlet to the pumping section.

Document having light-transmissive, electrically conductive authenticating interior layer

Abstract: A standardized document such as a credit card has a thin, light-transmissive, electrically conductive interior layer, the impedance, capacitance, or conductance of which can be sensed to indicate the authenticity of the document. When the document is cut to expose a new edge, the authenticating layer at that edge is not visible to the naked eye and hence should foil the ordinary counterfeiter.