Patents Assigned to Minnesota Mining
  • Cutting element with wear resistant crown
    Patent number: 4705124
    Abstract: A cutting element adapted to be used in a rotary drill bit is made by positioning in an appropriately shaped die cavity a quantity of a mixture of tungsten carbide and 4 to 11 percent cobalt in the shape of a crown for defining an outer surface for the tip portion of the cutting element using a pressure of less than about 600 pounds per square inch; positioning in the cavity a quantity of a mixture of tungsten carbide and 12 to 17 percent cobalt sufficient to form almost all of a base portion and at least an inner part of the tip portion for the cutting element; pressing the two quantities of the mixtures together and into the die at pressures in the range of about 10 to 15 tons per square inch; and sintering the pressed insert to form the cutting element.
    Type: Grant
    Filed: August 22, 1986
    Date of Patent: November 10, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Gerald R. Abrahamson, Ernest J. Duwell
  • Polyhydridosilanes and their conversion to pyropolymers
    Patent number: 4704444
    Abstract: A polyhydridosilane has a catenated silicon backbone of 9 to 4000 silicon atoms with an average number of hydrogen atoms per silicon atom in the range of 0.3 to 2.2, at least 0.1 gram of the polyhydridosilane being soluble at 20.degree. C. in 100 grams of tetrahydrofuran, toluene, or methylene chloride. The polyhydridosilane can be derivatized or it can be converted to a pyropolymer or a nitrogen-containing pyropolymer which is useful as an abrasive, ceramic, electrical, or electro-optical material.
    Type: Grant
    Filed: May 20, 1986
    Date of Patent: November 3, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Katherine A. Brown-Wensley, Robert A. Sinclair
  • Mold having ceramic insert
    Patent number: 4704079
    Abstract: A improved mold, apparatus and method for injection molding is provided. The apparatus is of the type which includes a means for opening and closing a multi-part injection molding mold, means for supplying molten material under high pressure into the mold cavity when the mold is closed and means for removing articles molded in the cavity on cooling. The improvement is provided by a new multi-part mold which is made up of at least two parts. Each part of the mold comprises a mold block portion having a ceramic mold cavity insert. The ceramic mold cavity inserts define the walls of the mold cavity when the mold is closed. Each mold cavity insert comprises a shaped ceramic body having a mounting surface adapted to fit under compressive stress throughout the entire molding operation within a mounting cavity of the mold block portion.
    Type: Grant
    Filed: April 11, 1986
    Date of Patent: November 3, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Arthur W. Pluim, Jr.
  • Drag mechanism for fly fishing reel
    Patent number: 4703902
    Abstract: A fly fishing reel includes a drag mechanism having a rotor attached to the line-storage spool. The rotor is frictionally engaged by two elastomeric annular rings which are variably compressed by two shell halves which are in turn compressed by a drag-adjustment knob threaded to a shaft which supports and journals the spool.
    Type: Grant
    Filed: April 29, 1986
    Date of Patent: November 3, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Harry A. Prouza, Herman G. Voss
  • Wide-angle-reflective cube-corner retroreflective sheeting
    Patent number: 4703999
    Abstract: Cube-corner retroreflectors having a rear surface configured with a cube-corner reflective element are made capable of reflecting light over a wide range of incident angles by placing a specularly reflective surface shaped as a negative of the cube-corner reflective element in closely spaced mating relationship with said rear surface.
    Type: Grant
    Filed: June 16, 1986
    Date of Patent: November 3, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Gerald M. Benson
  • Method for adhering surfaces using fast curing epoxy resin compositions
    Patent number: 4704331
    Abstract: A method for adhering surfaces together using fast curing epoxy resin compositions is provided. The method includes the steps of mixing together (a) a curable glycidyl ether epoxide group-containing compound, (b) an amino-terminated aliphatic polyether curing agent, (c) a polymeric toughening agent having both a rubbery phase and a thermoplastic phase or being capable of forming, with the epoxide group-containing material, both a rubbery phase and a thermoset phase on curing, and (d) a metal salt catalyst capble of providing an exotherm of at least 20.degree. C.; applying the resulting mixture to a portion of at least one surface; contacting the surface having the mixture applied thereto to a second surface in bonding relationship with the mixture disposed between the surfaces; and curing the mixture.
    Type: Grant
    Filed: February 9, 1987
    Date of Patent: November 3, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Janis Robins, Charles D. Wright
  • Sheetstock dispensable from a corner nip feeder
    Patent number: 4704317
    Abstract: Sheetstock which is too stiff to be dispensed reliably from corner nip feeders is modifed to make it dispensible by forming a diagonal path of relatively low stiffness across each of at least two adjacent corners, preferably all four corners. Such a path preferably is made by forming slits, scores or a line of perforations extending at 45.degree. to the edges of the sheetstock.
    Type: Grant
    Filed: September 15, 1986
    Date of Patent: November 3, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Brice G. Hickenbotham, Gary R. Hanson
  • Printing ink
    Patent number: 4704163
    Abstract: Ink composition comprising a conventional flexographic ink stock, a low adhesion backsize compound, and, optionally, a chlorinated polyolefin. This ink composition can be used to print on webs, e.g. tapes, bearing a low adhesion backsize on one major surface thereof and a pressure-sensitive adhesive on the other major surface thereof.
    Type: Grant
    Filed: January 23, 1985
    Date of Patent: November 3, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Eugene L. Baratto, Donald J. David, Bernard S. Truskolaski, Maan-Shi S. Wu
  • Backing for binding sheets
    Patent number: 4702659
    Abstract: Loose pages can easily be bound in a cover having a strip of aggressive pressure sensitive adhesive near the fold line by aligning the pages with the outer edge and then rolling the inner edge of the cover and pages to shingle the edges along the adhesive to attach each page.
    Type: Grant
    Filed: May 19, 1986
    Date of Patent: October 27, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Gary R. Hanson
  • Pleochroic dyes and electro-optical displays therewith
    Patent number: 4702561
    Abstract: N-substituted anthraquinones in which the substituent group is at least partially cyclic, either cyclohexyl or aromatic, and including anils of 1,4- and 1,8-diaminoanthraquinone with p-alkyl- and p-alkoxybenzaldehyde, are pleochroic and form guest-host combinations with dielectrically positive anisotropic nematic liquid crystals. These combinations are of value in electro-optical display devices.
    Type: Grant
    Filed: August 28, 1979
    Date of Patent: October 27, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: William A. Huffman
  • Heat shrink package handle
    Patent number: 4700528
    Abstract: A length of tape 3 is bonded to a heat shrinkable film 2, and the film 2 is weakened along the edges of a central portion of the length of tape 3. The film 2 is then wrapped around an article or articles, has its two opposite ends sealed together, and is heat shrunk around the article or articles causing access openings 6, 7 in the sheet in the weakened areas along the central portion of the tape that can then be used as a handle for the resultant package 1.
    Type: Grant
    Filed: October 7, 1985
    Date of Patent: October 20, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Emile C. Bernard
  • Catheter and method for infusing fluid into a patient
    Patent number: 4701160
    Abstract: A medical catheter and a method for infusing blood into a patient. The medical catheter has first and second inlet openings, an outlet opening, a passageway connecting the openings, and a flexible valve member between the inlet openings. The valve member controls the size of the passageway between the inlet openings. The method includes inserting a conventional occlusion catheter into the medical catheter through the valve member and extending the tip of the occlusion catheter beyond the outlet opening of the medical catheter so that the blood vessel within the patient can be restrained.
    Type: Grant
    Filed: June 11, 1986
    Date of Patent: October 20, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Erin J. Lindsay, John N. Pittman
  • Oxidative imaging
    Patent number: 4701402
    Abstract: A radiation-sensitive element capable of recording an image upon image-wise exposure to radiation of selected wavelength, the element comprising, as the image-forming components, an effective amount of a bleachable dye in reactive association with an iodonium ion. Suitable dyes include polymethine dyes having an oxidation potential between 0 and +1 volt.
    Type: Grant
    Filed: December 30, 1985
    Date of Patent: October 20, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Ranjan C. Patel, Ian J. Ferguson, Herbert J. Pennicott
  • Electrical connector
    Patent number: 4700997
    Abstract: An electrical connector for removably attaching a flat electrode to a conducting cable is shown. Flat, conductive upper and lower jaws are connected at the rear by flexible, resilient spring means, and are spaced apart at the front. The jaws are mounted within a housing, and are surmounted by a slide actuator having a finger movable member passing through a slot in a housing roof. The actuator slides on a guide means having a front planar surface and a rear planar surface higher than the front planar surface, the two planar surfaces connected by a ramp in a transition area. In the forward position, the actuator compresses the jaws together on the surfaces of the flat electrode to tightly hold the electrode in a locked conductive connection, and simple finger movement of the actuator releases the electrode.
    Type: Grant
    Filed: November 14, 1986
    Date of Patent: October 20, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Jerome E. Strand
  • Slanted pole head for magnetic recording
    Patent number: 4700253
    Abstract: A magnetic pole head for recording and playback is described. Its features, as illustrated in FIG. 1 are: a high permeability core 1, a magnetic field producing means 3, and an acute angle .phi. between the bottom surface and side surface at the trailing portion of the head (i.e. the portion which influences the recording medium 5 last). It has been found that this improved pole head significantly increases the derivative of vertical magnetic field intensity with respect to lateral distance. This increase in the rate at which vertical field intensity changes will allow for higher density perpendicular recording than is feasible with conventional vertical heads.
    Type: Grant
    Filed: November 22, 1983
    Date of Patent: October 13, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Joel A. Gerber, Jerry A. Sievers
  • Azlactone-containing pressure-sensitive adhesives
    Patent number: 4699843
    Abstract: Pressure-sensitive adhesives are prepared by the simultaneous polymerization of minor amounts of at least one alkenyl azlactone monomer and at least one arylic-functional carboxylic acid monomer, or precursors thereof, with a major amount of at least one acrylic monomer. The pressure-sensitive adhesives, after application to a substrate, will significantly increase in adhesion to the resultant bonded substrate after they are in the bonded configuration.
    Type: Grant
    Filed: June 24, 1986
    Date of Patent: October 13, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Robert R. Charbonneau, Steven M. Heilmann, Jerald K. Rasmussen, Michael L. Tumey
  • Electrical simulator for biological tissue having remote control
    Patent number: 4699143
    Abstract: An electrical stimulator for biological tissue having remote control. A remote element communicates an operator response to the electrical stimulator. A control element samples the communication from the remote element and adjusts one or more of certain of sets of stimulus parameters maintained in a storage element and utilizes the adjusted stimulus parameters to generate an electrical stimulus signal or utilizes the communciation from the remote element to trigger the generation of an electrical stimulus signal based upon the stored stimulus parameters.
    Type: Grant
    Filed: June 17, 1985
    Date of Patent: October 13, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Joel R. Dufresne, Alan P. Dieken
  • Heat-recoverable sheet for use as protective closure
    Patent number: 4699821
    Abstract: A heat-recoverable sheet is provided having two opposing exterior transverse edges and interior edges transverse to the direction of recovery of the sheet extending from one of said exterior edges. When the heat-recoverable sheet is coated on one face thereof with a hot-melt adhesive and used as a wrap-around protective closure with the interior edges and the hot-melt adhesive enveloped within the closure, the movement of the enclosed exterior edge during recovery is retarded to minimize the formation of any void spaces in the hot-melt adhesive.
    Type: Grant
    Filed: August 19, 1985
    Date of Patent: October 13, 1987
    Assignee: Minnesota Mining & Manufacturing Company
    Inventor: William A. Hallock
  • Photographic tanning developer formulation
    Patent number: 4699868
    Abstract: An alkaline aqueous tanning developing solution for photographic image development comprising at least one hydroxylamine derivative. Preferred formulations may also contain at least one water-miscible polyhydroxy aliphatic organic solvent and/or a developing agent which comprises a polyhydroxybenzene compound having at least two hydroxy groups and at least one electron withdrawing and good leaving group suitable for nucleophilic addition.
    Type: Grant
    Filed: August 18, 1986
    Date of Patent: October 13, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Gebran J. Sabongi
  • Pressure-sensitive adhesive having broad useful temperature range
    Patent number: 4699842
    Abstract: Pressure-sensitive adhesive composition, sheet material coated therewith, and a kit for installing insulation around windows comprising the coated sheet material. The adhesive composition consists essentially of a first component consisting essentially of a tackified, emulsifiable adhesive and a second component consisting essentially of at least one terminally unsaturated vinyl monomer, at least one vinyl-unsaturated, homopolymerizable, emulsifier monomer, and, optionally a small amount of an external emulsifier. The adhesive provides high tack and excellent adhesion at both low temperatures and high temperatures, thus rendering it suitable for outdoor use in areas that encounter extremes of weather.
    Type: Grant
    Filed: October 17, 1985
    Date of Patent: October 13, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Jens L. Jorgensen, Thomas E. Haskett, John T. Rueb