Patents Represented by Attorney James A. Smith

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  • Pressure-sensitive adhesive tape containing hydrophobic silica
    Patent number: 4749590
    Abstract: By incorporating hydrophobic silica into acrylic pressure-sensitive adhesive tape, the shear strength at elevated temperatures is significantly improved, and adhesion and physical properties are maintained or improved. The hydrophobic silica preferably has a surface area from 50 to 400 m.sup.2 /g. A preferred acrylic pressure-sensitive adhesive layer comprises a copolymer of (a) at least one alkyl acrylate having an average of 4-12 carbon atoms in its alkyl group and (b) from 3 to 20% by weight of copolymerizable monomer having a polar group such as acrylic acid.
    Type: Grant
    Filed: August 17, 1987
    Date of Patent: June 7, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Jurgen Klingen, Patrick G. Zimmerman
  • Apparatus for manufacturing an electret filter medium
    Patent number: 4749348
    Abstract: The present invention relates to a continuous method for manufacturing an electret filter medium from dielectric material having an open or porous structure, said method comprising the steps of continuously feeding a web of dielectric material with a substantially closed dielectric foil adjacent to at least one major face thereof into a corona discharge device, reducing the thickness of the web of dielectric material and charging the web of reduced thickness dielectric material by means of a corona discharge and to apparatus for carrying out said method.
    Type: Grant
    Filed: February 3, 1986
    Date of Patent: June 7, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Petrus T. A. Klaase, Jan van Turnhout
  • Tamper-indicating package with randomly disposed filaments
    Patent number: 4749084
    Abstract: Tamper-indicating package comprising two webs, each of which comprises a layer of polymeric material and a layer of continous filaments disposed in a random arrangement. The filaments are bonded to said polymeric layer. Upon access to the interior of the package, either the random arrangement of filaments will be altered or the polymeric layer will be damaged, thus indicating that the package has been subject to tampering.
    Type: Grant
    Filed: November 12, 1986
    Date of Patent: June 7, 1988
    Assignee: Minnesota Mining and Manufacturing Co.
    Inventor: Rodger J. Pereyra
  • Composite article containing rigid layers
    Patent number: 4749617
    Abstract: An article having two rigid layers joined by an aziridine-containing layer is provided.
    Type: Grant
    Filed: December 18, 1985
    Date of Patent: June 7, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: George Canty
  • Head positioning mechanism for data cartridge recorder
    Patent number: 4750067
    Abstract: A head positioning add mechanism for a multitrack data cartridge recorder including a stepper motor, a lead screw driven by the stepper motor and a head mounting slide engaged with the lead screw by a partial female thread for incrementally moving a recording/playback head transverse to the path of a magnetic recording tape to enable accurate positioning of the head at any given track across the tape.
    Type: Grant
    Filed: July 12, 1985
    Date of Patent: June 7, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Sten R. Gerfast
  • Camouflaged composite pressure-sensitive adhesive tape
    Patent number: 4748061
    Abstract: A pressure-sensitive adhesive tape having a camouflaged appearance has a cellular of foamlike pressure-sensitive core layer and at least one relatively thin, dense, pigmented pressure-sensitive adhesive surface layer. The thickness of the core layer may be about 0.1 mm and that of a surface layer about 0.03 mm. The surface layer of such a composite tape appears to be more intense in color than does either the core layer or the surface layer by itself. When viewed edgewise, the composite tape appears to present a color that is more intense than one would expect from viewing the edges of the core layer and surface layer by themselves.
    Type: Grant
    Filed: January 2, 1987
    Date of Patent: May 31, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: George F. Vesley
  • Dispenser for metering proportionate increments of polymerizable materials
    Patent number: 4747517
    Abstract: Extrudable materials that polymerize when mixed can be stored in a dispenser that has no internal valve and contains a tubular cavity of uniform cross section and a piston with which the materials can be incrementally extruded. The polymerizable materials are separated by a barrier layer extending between the polymerizable materials over the length of the cavity. The material of the barrier layer is insoluble in each of the polymerizable materials while being dispersible in a mixture of them. The polymerizable materials and the material of the barrier layer have sufficiently similar rheologies at the temperature at which they are to be extruded from the dispenser to ensure against intermixing until after they emerge from the outlet.
    Type: Grant
    Filed: March 23, 1987
    Date of Patent: May 31, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Duane H. Hart
  • Electrospray coating process
    Patent number: 4748043
    Abstract: An electrostatic coating system for applying very thin coating to a substrate in air at atmospheric pressure comprises a plurality of spaced capillary needles positioned in at least two rows and fed with coating liquid via a manifold. The needles are disposed concentric within holes in an extractor plate, a potential is developed between the capillary needles and the extractor plate affording a reduction of the liquid to a mist of highly charged droplets drawn to the substrate by a second electrical field. Insulative layers on the extractor plate provide increased droplet control.
    Type: Grant
    Filed: August 29, 1986
    Date of Patent: May 31, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Albert E. Seaver, Carey J. Eckhardt
  • Dual-status, magnetically imagable article surveillance marker
    Patent number: 4746908
    Abstract: A dual status magnetic marker for use in electronic article surveillance systems, in which a piece of low coercive force, high permeability material is positioned adjacent to a piece of remanently magnetizable material. The first piece is configured such that no characteristic response is produced when the magnetization of the entire piece is reversed by an alternating magnetic field in an interrogation zone, and when the second piece is magnetized with a predetermined pattern a localized field is provided which biases portions of the first piece, keeping those portions from reversing when the marker is in the interrogation field. The predetermined pattern is such that the remaining, unbiased portion of the first piece has a configuration capable of producing a characteristic response when the magnetization in that portion is reversed.
    Type: Grant
    Filed: September 19, 1986
    Date of Patent: May 24, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Samuel Montean
  • Silver halide radiation-sensitive photographic materials
    Patent number: 4746593
    Abstract: A negative-acting photographic element comprising a support having coated thereon one or more layers of a radiation-sensitive silver halide emulsion, at least one of the layers containing a hydrazine compound in which the one or more radiation-sensitive silver halide layers contain a first silver halide emulsion having an average grain size of from 0.1 to 0.4 microns and a second silver halide emulsion of particles with an average grain volume of less than one half that of the particles of the first emulsion.
    Type: Grant
    Filed: July 2, 1986
    Date of Patent: May 24, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Jonathan P. Kitchin, Kevin P. Hall
  • Subbed supports for imaging materials
    Patent number: 4746595
    Abstract: Subbing layers on carrier elements for use with photopolymerizable, photosolubilizable, and photodepolymerizable compositions are advantageously comprised of polyureas and polybiuret polymer.
    Type: Grant
    Filed: April 22, 1986
    Date of Patent: May 24, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: James F. Sanders
  • Pad enclosure
    Patent number: 4746018
    Abstract: An enclosure for a pad of notepaper including a rectangular elongate sheet of stiff paper material bent at scores to define along the length of the sheet an upper front portion adapted to overlie a part of the front surface of the pad, top, rear and bottom portions adapted to respectively overlie the top rear and bottom surfaces of the pad, and a lower front structure adapted to overlie a minor part of the front surface of the pad and having a recess adapted to frictionally and removably receive an end part of the upper front portion to close the enclosure.
    Type: Grant
    Filed: September 11, 1986
    Date of Patent: May 24, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: David C. Mueller
  • Isocyanate-terminated sulfocompounds
    Patent number: 4746717
    Abstract: An isocyanate-terminated sulfocompound is the reaction product of a polyisocyanate and a sulfopolyol or sulfopolyamine which is the reaction product of one mole of a sulfodicarboxylic acid and about two moles of an aliphatic polyol or polyamine having two or more hydroxyl or amino groups attached to a linear chain and having a molecular weight of up to 2000. The sulfocompound can be reacted with ethylenically-unsaturated alcohols, water, polyamines, or polyols, to give ethylenically-unsaturated sulfocompounds, sulfopolyureas or sulfopolyurethanes.
    Type: Grant
    Filed: January 22, 1987
    Date of Patent: May 24, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Wayne K. Larson
  • Image deletion fluid for printing plate
    Patent number: 4746597
    Abstract: An image deletion fluid for printing plates which use a silver image as an ink-receptive area. The deletion fluid comprises iodine and an effective excess of iodide ion, which form a triiodide complex, and a hydrophilic-matrix-forming agent. In a preferred embodiment, the deletion fluid further comprises an organic, preferably polar, solvent. The deletion fluid is applied to the surface of the plate, rubbed briefly and allowed to dry there, with no removal or rinsing away of the deletion fluid or by-products required.
    Type: Grant
    Filed: October 22, 1986
    Date of Patent: May 24, 1988
    Assignee: Minnesota Mining and Manufacturing Co.
    Inventors: Bruce A. Zellmer, David R. Boston
  • Zoom lens having magnification factors in the range of 14X to 32X for micrographic applications
    Patent number: 4746204
    Abstract: A zoom lens system having magnification factors in the range of 14 to 32. The lens system of the invention is particularly useful in micrographic reader/printers.
    Type: Grant
    Filed: April 1, 1987
    Date of Patent: May 24, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Gerhardt H. Pareigat
  • Reusable developing powder composition
    Patent number: 4745418
    Abstract: A non-fusible, monocomponent toner is described which comprises an organic resin having a high fusion point, a magnetically responsive material admixed therewith, and an electrically conductive surface. The toner is capable of being repeatedly used.
    Type: Grant
    Filed: April 30, 1986
    Date of Patent: May 17, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Thomas J. Brennan, Nancy N. Quan
  • Telephoto lens assembly for overhead projector
    Patent number: 4744641
    Abstract: The invention consists of a four-element telephoto projection lens for use in conventional overhead projectors, which lens assembly affords an extended projection distance from the lens to the projection screen while retaining the same back focus as conventional two-element projection lenses for overhead projectors.
    Type: Grant
    Filed: June 1, 1987
    Date of Patent: May 17, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Dennis Vanderwerf
  • RF reactivatable marker for electronic article surveillance system
    Patent number: 4745401
    Abstract: A marker for use in radio frequency electronic article surveillance systems where the marker contains an inductive-capacitive resonant circuit and is made reversibly deactivatable and reactivatable by the addition of a piece of magnetic material and means, such as a piece of permanently magnetizable material, for biasing the first material to prevent alternating fields induced therein from changing the magnetic state of that material, thereby preventing hysteresis losses from causing a lowering of the Q of the resonant circuit below the point of detection.
    Type: Grant
    Filed: September 9, 1985
    Date of Patent: May 17, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Samuel Montean
  • Cartridge door-latching mechanism
    Patent number: 4744530
    Abstract: Door-latching mechanism for a molded plastic cartridge includes a plastic arm projecting from a wall of the cartridge and acting as a cantilevered spring. At the free end of the arm are a door-locking pawl which locks the door when the spring is at rest and unlocks the door when the spring is flexed. When the cartridge is a VHS or Betamax videocassette, upon inserting it into a recorder, a finger of the recorder depresses the arm and with it the door-locking pawl, thus unlocking the pawl and allowing the door to be opened. The arm may either be integral with the cartridge or molded as a separate plastic piece to be attached to the cartridge.
    Type: Grant
    Filed: September 12, 1986
    Date of Patent: May 17, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Claude E. Cybulski, Gregory H. Johnson
  • Container for type correction fluid
    Patent number: D295954
    Type: Grant
    Filed: May 13, 1985
    Date of Patent: May 31, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Kenneth J. Kirchhoff