Showing papers by "3M published in 1970"

Method and apparatus for automatic peritoneal dialysis

Abstract: A method and apparatus for automatic peritoneal dialysis which includes a series of steps for the exchange of dialysate which proportions the in-flow to the out-flow and provides for the elimination of any distressing in-flow or out-flow pressures on the patient and any abnormal build-up of fluid quantity in the patient. The apparatus includes a portable bed-side unit which carries the necessary pumps and valves for the automatic cycle and includes a disposable plastic sheet unit supported on the apparatus which is positioned such that pumps and valves in the apparatus can operate on this unit when in place.

Method and device for internally locating and sealing pipeline leaks

Abstract: A method and a device for internally locating leaks in a pipeline and sealing the leak without interrupting the normal use of the pipe The device has a tubular rigid body which is open at both ends and is covered on the outside by an inflatable sleeve which can be pressurized to seal off a liquid-tight cavity between the pipe wall and the sleeve surface The pipe is tested for leaks by pressurizing the cavity with a test liquid and thereafter observing the pressure drop to determine if a leak is present If a leak is discovered, a settable liquid sealant is forced into the cavity filling the leak

Method of forming web material

Abstract: A method of forming a resilient open fibrous web of inter-engaged coarse continuous kinky filaments, with one major surface of the web being flattened The method involves extruding a bundle of filaments of a thermoplastic material, aligning the bundle so the filaments fall into a quench bath and upon a contact surface so as to provide differential quenching, and advancing the resulting web at a slower rate than the rate of extrusion

Moisture-resistant solar control film

Abstract: Solar control film having a water-activatable adhesive system comprising a normally tacky and pressure-sensitive adhesive coating which is covered by a thin tack-free continuous water-soluble layer. The product, which does not require a liner, can be moistened and installed on a windowpane, the water-soluble layer providing lubrication during positioning and the pressure-sensitive adhesive providing the primary bonding to the glass.

Tin/lead plating bath and method

Abstract: A plating bath for electrodeposition of tin/lead alloys contains stannous ion, lead ion, a fluoborate, fluosilicate or sulfamate radical and, as a brightener system, a nonionic polyoxyalkylated surfactant, a lower aliphatic aldehyde, an amine and a cyclic brightener selected from the group consisting of heterocyclic carboxaldehydes, aromatic ketones and carboxylic acids, the pH of the bath being less than about 3.0.

Torque transmitting device

Abstract: A torque transmitting device in which a plurality of fibers extend perpendicularly from one of a pair of normally opposed, generally parallel surfaces to engage circumferentially spaced protuberances defining the other surface. The torque transmitting surfaces are defined on a pair of relatively rotatable members and the extent of fiber engagement is adjustable to permit adjustment of the torque transmitted between the members by engagement of the fibers with the protuberances upon relative rotation of the members.

Packaging of semiconductor devices

Abstract: A packaging device is provided for the housing of semiconductor devices to facilitate handling, testing and later attachment thereof to further electrical circuitry. The packaging device comprises a self-supporting dielectric substrate in the form of a channel and a plurality of conductive land areas on the inner surfaces of the channel. The land areas define at least one site within the channel which is adapted to electrically receive a semiconductor device. The land areas extend outward from said site in the form of fingers, the fingers extending upwardly along the side walls of the channel so as to be exposed for later attachment thereof to further electrical circuitry.

Apparatus for particulate coating of an elongate article

Abstract: A substantially closed shell contains an air pervious liner defining an inner chamber for coating an article with thermoadhesive particles. Air flowing continuously through the liner toward the article in the chamber prevents buildup of the thermoadhesive particles on either the top or sides of the chamber. The chamber may be formed with a pair of openings to permit the entry and exit of pipe to be coated.

Strip-Line Methods for Dielectric Measurements at Microwave Frequencies

Abstract: Strip-line methods for measuring dielectric constants and loss tangent of sheet insulation, particularly of strip-line laminates, offer advantages for laboratory study and routine quality control of microwave dielectric properties at frequencies above 1 GHz. Theoretical and practical problems are discussed including possible strip circuit test patterns, effects of air gaps, correction for fringing field, adaptability to different dielectric thicknesses, and the relation of the measured loaded Q to both the unloaded Q of resonant strips and the dissipation factor of the dielectric period. Band-stop and band-pass filter test fixtures and measuring arrangements are described which are suitable for laboratory measurements or, when the filter circuit is made a permanent part of the fixture, for rapid and precise quality control testing. Dielectric properties measured at X-band (8-12 GHz) are given for a number of materials. Data are also included on the variability of copper-clad glass cloth-reinforced polytetrafluoroethylene (PTFE) and the dependence of apparent dielectric constant on clamping pressure and test temperature.

Method for marking roadways

Abstract: A method for forming traffic-control markings on roadways using a novel particulate marking material. The marking material is heated and projected to the roadway, and the resulting markings are ready to bear wheeled road traffic within seconds. The marking material comprises a particulate thermoplastic-resin-based composition having an organic phase that melts to a low-viscosity condition and principally comprises a polyamide resin. It also preferably includes an inert particulate material, preferably transparent glass beads, that is non-melting at the temperature of application of the marking material.

Deformable fin spring connector

Abstract: A tapered coiled spring wire secured within an insulating shell containing interior deformable fins for engagement with the spring wire to form retaining threads in the fins and avoid any substantial tensioning or deformation of the shell

Ski with cut-resistant surface covering

Abstract: Skis and similar structures are provided with a cut-resistant decorative surface layer of urethane resin on a fibrous support. The protective surface layer may be removed and replaced as needed. The ski is protected against marring and scratching and is stabilized against chatter.

Multi-component mixing apparatus

Abstract: An apparatus for mixing a plurality of separate flowable materials in desired proportions. The apparatus includes a positive displacement piston pump for each material and a mixer. The piston displacement of each pump is regulated, either by an oil reservoir system or by adjustable crank arms, so that each pump delivers material in the proper proportion. The outlet of each pump is connected to the mixer, wherein the materials are thoroughly mixed by a rotating agitator vane and delivered as a thoroughly mixed composite of all of the individual materials.

Stable polymer latex and process for making same

Abstract: The disclosed self-emulsified polyurethane polyurethane-polyurea latices are formed by chain extending in water a prepolymer which contains per molecule about two isocyanate groups at the ends of a chain and attached to some of the prepolymer chains a pendant group having at its remote end a salt-forming group or a hydrophilic group which produces the self-emulsifying characteristic.

Sheet-cleaning apparatus

Abstract: An inexpensive manually operated device for thoroughly cleaning photographic film negatives. The device includes two pneumatically inflated cylinders that press two lengths of wiping cloth into even and intimate contact with opposite surfaces of a negative passed between the lengths of cloth. The device blows ionized air across the negative after it is wiped clean to neutralize any static electrical charges present on the negative.

Conductor identification via counting means at a remote position

Abstract: Improved method for cable conductor identification characterized by automatically stepping a source of an identifiable signal onto respective conductors at an identified end thereof, and synchronously stepping a co-connected counter at a remote position where a conductor is to be identified until the tone is detected on a given conductor with which the counter is also connected, and thereupon stopping the counter. The counter thus identifies the conductor being monitored. Also disclosed are specific embodiments in which a plurality of conductors are identified by a plurality of counters at the remote position, as well as the structure of apparatus enabling carrying out the invention. The invention alleviates problems with propagation delay, since no feedback is required; and it allows high rates, or frequencies, of stepping while still obtaining positive identification of the conductors, since the identifiable signal and a counting signal are impressed onto conductors at the identified end concurrently within a given sub-cycle as nearly simultaneously as required by the frequency of the stepping.

Elemental analyzing apparatus

Abstract: A compact instrument for solid surface analysis comprising a compact ion generator, a movable target support, an energy analyzer and an ion detector mounted together on a flange adapted to form the end wall of a vacuum chamber.

Solids dispenser having magnetic valve in throat

Abstract: A magnetic valve for controlling the flow of solids is provided. It consists essentially of an orifice feeding tube with a magnetizing coil surrounding it, so that lines of force of the coil are generated axially of the throat and a spindle fitting into the throat of the tube and having its geometrical axis parallel with the direction of flow through the tube and a magnetic axis at right angles thereto. In addition an antibridging and anti-loading device is provided above the spindle to prevent bridging of the orifice at that point by packing of the dry powder and packing of powder against the spindle.

Dropout compensator having a self-balancing switch

Abstract: The present invention is directed to an improved dropout compensator having a self-balancing video switch that provides an output signal having substantially a constant average voltage level The self-balancing video switch is coupled to receive a direct video signal provided by a demodulator and normally conducts the direct video signal as the dropout compensator output signal When a dropout is detected by a dropout detector, the dropout detector applies gate signals to the self-balancing video switch When the self-balancing video switch receives the gate signals, the switch terminates conducting the direct video signal and initiates conducting a delayed video signal as the dropout compensator output signal The self-balancing video switch includes a balancing circuit that maintains the switch output signal at a substantially constant average voltage level when switching between the direct and the delayed video signal

Fluorochemical foam stabilizer and foamed isocyanate-derived polymers made therewith

Abstract: Active hydrogen-containing fluorochemical is used as a foam stabilizer for foamed isocyanate-derived polymers. For example, rigid or flexible polyurethane foams with high or low density and uniform cellular structure are prepared using fluoroaliphatic radical-substituted polyamines as foam stabilizers.

Electron beam laser

Abstract: A longitudinal-direction laser. The laser device comprises a source of electrons and a light resonant cavity which includes a direct band-gap semiconductor crystal having a pair of spaced, opposing, smooth faces. When a beam of electrons of at least a predetermined energy and current density is impinged upon one of the crystal faces, laser emission produced within an active region of the crystal is emitted from at least one of the crystal faces in a direction generally longitudinal to the direction of the beam of electrons. When laser emission is produced, the active region depth is less than the crystal thickness in the direction normal to the opposing faces.

Heat-sensitive copy-sheet

Abstract: Heat-sensitive copy-sheet coatings comprise highly methanolsoluble amine adducts of organic acidic materials The sheets may be clear and transparent, becoming light-diffusing on heating In a preferred form they contain amine-reactive color progenitors and become colored on heating The presence of a mutual solvent does not cause the color-forming reaction to take place, and the reactants may therefore be coated together in a single application

Electrographic copying machine

Abstract: A system for handling and transporting the intermediate web in an electrographic copying machine which utilizes an intermediate web to produce copies of graphic intelligence. The system comprises a cartridge formed of two molded shells which contain a supply of intermediate web wound between two rollers. The rollers extend beyond the sides of the cartridge and a section of the web between the rollers is disposed externally to the cartridge. The cartridge is removably mounted on a movable carriage having a flat conductive peripheral support area supporting said external web section. Means is provided to transport the carriage thus moving the supported section of web in proper sequence from an imaging system or exposure station to a development and a transfer station on the copying machine and to then return the carriage to the imaging station in order to produce the desired copies. Drive means is provided on the machine to change the section of web disposed externally to the cartridge as is needed in producing subsequent copies. The web change is accomplished by winding the web from one roller onto the other.

Keepered plated-wire memory

Abstract: A plated-wire memory array, and a method of making the same, including a flexible integrally molded grooved keeper and word conductor combination having reinforcing material molded to the base of the keeper, plated bit wires in intimate contact with the keeper, and a ground plate.

Magnetic viewer device having movable anisotropic elements

Abstract: A magnetic data viewer device for providing a visual indication of data encoded in a magnetically encoded document, which data is represented by the magnetic polarity alignments at each of a plurality of disparate magnetized regions defining a fixed twodimensional pattern. This device is a non-magnetizable board containing a plurality of sockets positioned in a fixed pattern. The sockets each contain a disk containing magnetically hard material which is magnetized to have a given magnetic polarity alignment. At least one broad surface of the disk has a visual indicator for providing an indication of the magnetic polarity alignment of the disk. Each of the disks is visible in its socket, is restrained from movement within its socket by only the dimensions of the socket, and is movable within its socket to assume an orientation corresponding to the magnetic polarity alignment at a said magnetized region. In one preferred embodiment, the magnetically hard material of each disk is magnetized to provide a polarity alignment wherein the opposite broad surfaces of each disk have opposite magnetic polarities; the broad surface of one polarity has a visual indicator of a first color and the broad surface of the opposite polarity has a visual indicator of a second color; and each disk is movable to assume any orientation within its socket. In another preferred embodiment, the manetically hard material is magnetized to provide a polarity alignment wherein one broad surface has a pair of magnetized sections of opposite polarities having a boundary therebetween, and the opposite broad surface has a visual indicator corresponding to the boundary for indicating the orientation of the boundary. In both embodiments, each disk preferably includes uniaxially anisotropic magnetically hard material oriented to have an easy axis of magnetization perpendicular to the broad surfaces of the disk. The magnetically hard material is magnetized in the direction of this easy axis. The residual induction Br of each disk and the spacing of the sockets are so selected that, in the absence of an applied external magnetic field, the disks are attracted by each other to align themselves in a stable position wherein the broad surfaces of the disks are skewed in the sockets.

Lock alarm structure

Abstract: A lock and alarm structure incorporating a signal-generating device within a casing which is adapted for mounting on a closure member. A bolt housing is resiliently mounted in said casing and slidably receives a bolt. The bolt housing is mounted to pivot on the bolt and the bolt is formed with a resilient sidewall to permit the bolt housing to pivot on its mounting. A switchactuating lever is pivotally mounted on the bolt housing and extends through an opening in the casing such that relative movement between the intermediate portion of the bolt housing and the casing, upon pivoting of the bolt housing, will actuate the signal-generating device. The switch lever is positioned adjacent the bolt and is not easily accessible.

Electrically insulative tape

Abstract: Electrically insulative tape comprising a base electrically insulative sheet impregnated or coated with a resin composition that includes epoxy resin and an acid-terminated ester reaction product of hydrogenated castor derivative and dicarboxylic acid or anhydride.

Cartridge-type crimping tool

Abstract: A hand tool which rigidly holds a connector in position to accept a plurality of wires to be joined, assures permanent electrical connection by retaining the connector until a proper crimp has been made, forces the properly crimped connector from the tool, and automatically presents a new connector in the proper position from a supply cartridge. The connectors are of the type having a wire receiving base portion and a telescoping cover portion movable into the base portion.

Magnetically encoded document

Abstract: A magnetically encoded document including a broad stratum containing magnetically hard material which is magnetized to represent encoded data as a plurality of disparate magnetized regions of various polarity alignments defining a fixed twodimensional pattern in the document, wherein upon at least one broad surface of the stratum each magnetized region has magnetized sections of opposite polarities having a narrow boundary therebetween, wherein the angles to which the boundaries extend breadthwise in the stratum of the document represent encoded data, with any given angle being unique to certain data. The document may be magnetically encoded by contacting the document with a pair of oppositely magnetized pole piece faces of a magnetizer key, which magnetizer key includes a tapered permanent magnet and two pole pieces disposed on opposite polarity sides of the permanent magnet, with the pole piece faces being separated by a narrow gap adjacent the narrow end of the permanent magnet.

Three-element microphotographic objective lens

Abstract: A three-element f/4.5, 19 X magnification objective lens comprising three airspaced elements from front to rear including a biconvex lens element, a biconcave lens element and a concavoconvex lens element.