Patents Represented by Law Firm Alexander, Sell, Steldt & DeLaHunt
  • N-alkylsulfonylperfluoroalkanesulfonanilides
    Patent number: 3981914
    Abstract: N-alkylsulfonyl and N-haloalkylsulfonyl-substituted perfluoroalkanesulfonanilides and processes for their preparation are disclosed. These compounds and their compositions are useful as herbicides and plant growth modifiers.
    Type: Grant
    Filed: August 3, 1971
    Date of Patent: September 21, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Edward L. Mutsch, Joseph Kenneth Harrington
  • Silicone-compatible azo dyestuffs
    Patent number: 3981859
    Abstract: Azo dyestuffs containing the tris(trimethylsilyloxy)silylalkylamino group, ##EQU1## are produced and are found to be compatible with cured silicone polymers.
    Type: Grant
    Filed: August 28, 1974
    Date of Patent: September 21, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Carl Mayn Smith, George Van Dyke Tiers
  • Electro-optical feedback signal producing apparatus
    Patent number: 3982124
    Abstract: Apparatus and circuitry for positioning a mirror at a desired position includes an electric to rotary motion transducer means connected with the mirror which is controlled by a signal obtained in response to an electrical positioning signal and a feedback signal derived from the actual mirror position. An electro-optical sensing means resonsive to the actual position of the mirror provides the feedback signal. The circuitry is automatically calibrated.
    Type: Grant
    Filed: October 8, 1975
    Date of Patent: September 21, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: David J. Schoon
  • Metal-clad dielectric sheeting having an improved bond between the metal and dielectric layers
    Patent number: 3981691
    Abstract: An improved bond between the metal and dielectric layers of metal-clad dielectric sheeting is obtained by use of a black-chromium treatment on the metal layer.
    Type: Grant
    Filed: July 1, 1974
    Date of Patent: September 21, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Edward A. Cuneo
  • Perfluorotertiaryalkyl ethers
    Patent number: 3981928
    Abstract: A monohydroxyalkyl, perfluorotertiaryalkyl ether, said monohydroxylalkyl group having no more than 16 carbon atoms and said perfluorotertiary alkyl group having the structure ##EQU1## where R.sub.f is a perfluoroalkyl group of less than 10 carbon atoms.
    Type: Grant
    Filed: April 13, 1970
    Date of Patent: September 21, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Frank J. Pavlik
  • Sensitizing a thermographic silver halide photographic material with monomeric amide
    Patent number: 3980482
    Abstract: Photosensitive heat-developable dry silver sheet materials, containing organic silver salt and reducing agent and in which a minor portion of the silver salt has been halidized, are given an orders-of-magnitude increase in photographic speed by incorporating an organic sensitizing amide prior to halidizing.
    Type: Grant
    Filed: June 5, 1974
    Date of Patent: September 14, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Jack E. Reece
  • Fluoroaliphatic phenols
    Patent number: 3979463
    Abstract: Fluoroaliphatic phenols are prepared by reacting an olefinic phenol with a perfluoroalkyl sulfonyl chloride, bromide, or fluoride in the presence of a free radical catalyst at a temperature of from about 100.degree.-150.degree. C. The fluoroaliphatic phenols are useful in the preparation of condensation products with aldehydes which products are substantive to the skin and render the skin or similar materials repellent to aqueous and oily materials.
    Type: Grant
    Filed: March 18, 1974
    Date of Patent: September 7, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Leland S. Endres
  • Compact overhead projector
    Patent number: 3979160
    Abstract: A compact portable overhead projector providing improved uniformity and efficiency of illumination employs an off-focus light source within a truncated light-diffusing ellipsoidal reflector in conjunction with an off-focus aperture plate adjacent the open end of the reflector.
    Type: Grant
    Filed: March 3, 1975
    Date of Patent: September 7, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Raymond H. Anderson, Ning Wu
  • Temperature and supply voltage compensated amplifying device
    Patent number: 3978419
    Abstract: A voltage amplifying device that is compensated to reduce variations in its output voltage due to changes in temperature or supply voltage by means of two transistors connected together so that changes in the base-emitter voltage of one transistor are counteracted by similar changes in the base-emitter voltage of the other transistor.
    Type: Grant
    Filed: January 6, 1975
    Date of Patent: August 31, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Robert P. Cummins, Paul C. Hunt
  • Controlled release capsules
    Patent number: 3977992
    Abstract: The disclosed substantially spherical capsules are particularly adapted for containing a liquid and have permeable or semi-permeable capsule walls. The capsule walls can comprise a first crystalline phase, an amorphous phase which ordinarily is intimately associated with the crystalline phase, and, preferably, a dispersed (discontinuous) second crystalline or semi-crystalline phase such as a wax. These capsules have the ability to release a solute by an effect resembling osmosis and to release a liquid by a transmission and evaporation mechanism.
    Type: Grant
    Filed: November 8, 1971
    Date of Patent: August 31, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: David A. Hofacker
  • Process for benz[f]-2,5-oxazocines
    Patent number: 3978085
    Abstract: An improved process is described for the preparation of 5-lower alkyl-1-phenyl-1,3,4,6-tetrahydro-5H-benz[f]-2,5-oxazocines in which 2-(N-hydroxyethyl=N=lower alkylaminomethyl)-benzhydrols are cyclized in the presence of aqueous hydrogen halide.
    Type: Grant
    Filed: March 7, 1975
    Date of Patent: August 31, 1976
    Assignee: Riker Laboratories, Inc.
    Inventor: John W. Eberlin
  • Magnetic head cleaning tape and method
    Patent number: 3978520
    Abstract: Magnetic heads of color video tape recorder (vtr) machines are cleaned without harmful abrasion by means of a novel magnetic head cleaning tape carrying a color bar signal. Abrupt appearance of the color bar test pattern at the video monitor permits cessation of the cleaning operation immediately upon complete removal of foreign matter and without harmful abrasion of the heads.
    Type: Grant
    Filed: November 29, 1974
    Date of Patent: August 31, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: John V. Nowicki, John D. Hakanson
  • Sparger
    Patent number: 3978176
    Abstract: A sparger useful for producing bubbles of uniform size in liquids is formed from a body comprised of a cured, thermosetting resin matrix enclosing spherical particles of substantially uniform size and containing numerous interconnecting passageways formed by the interstices between said enclosed particles.
    Type: Grant
    Filed: January 7, 1975
    Date of Patent: August 31, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Douglas W. Voegeli
  • Automatic tracking signal analyzer
    Patent number: 3978403
    Abstract: Method and apparatus for analyzing the harmonic distortion present in an input signal wherein first and second reference signals are generated differing by a small offset frequency. The first reference signal is mixed with the input signal to provide an intermediate carrier signal which is modulated with the second reference signal to provide a measurement carrier signal which in turn is modulated with the input signal to produce an output signal which is filtered to isolate a specific signal. By isolating a specific signal for each harmonic of the input signal to be analyzed, the proportion of each such harmonic is revealed as a percentage of the fundamental harmonic of the input signal.By adding a tunable oscillator to the apparatus, it may function as a wave analyzer, in which case the specific output signal represents the magnitude of any selected component of the signal to be analyzed.
    Type: Grant
    Filed: May 6, 1974
    Date of Patent: August 31, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Richard S. Mansfield, John A. McCracken, Robert J. Youngquist
  • Paper sawing machine
    Patent number: 3975975
    Abstract: A machine for sawing a plurality of spaced L-shaped slots through a stack of paper sheets starting from one edge surface of the stack, which slots are adapted to receive a device for binding the stack of sheets together. The machine includes a plurality of elongated saw blades having cutting teeth all around their peripheries and mounted side by side in spaced parallel relationship. The machine reciprocates the saw blades along their longitudinal axes to afford cutting engagement with the blades by the stack of sheets from any direction normal to the axes of the blades; while moving a planar support surface disposed normal to the axes of the saw blades and to which the stack of sheets is clamped in an L-shaped pattern to engage the stack of sheets with the saw blades and cut the L-shaped slots.
    Type: Grant
    Filed: October 2, 1975
    Date of Patent: August 24, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Joe D. Giulie, Leslie E. Worcester
  • 7-Hydroxy-benzo[ij]quinolizine-2-carboxylic acids, intermediates, and a method for their production
    Patent number: 3976651
    Abstract: Intermediates for and a process for preparing certain substituted 6,7-dihydro-7-hydroxy-1-oxo-1H,5H-benzo[ij]quinolizine carboxylic acids is described. The end products are useful antibacterial agents.
    Type: Grant
    Filed: April 14, 1975
    Date of Patent: August 24, 1976
    Assignee: Riker Laboratories, Inc.
    Inventors: John F. Gerster, Charles M. Leir
  • Antiemetic method
    Patent number: 3976774
    Abstract: A method of preventing emesis in mammals is disclosed which comprises administering to mammals in need thereof the compound anti-8-methylpiperazinyl-N'-carbonyldibenzobicyclo[3.2.1]octadiene or a pharmaceutically acceptable acid addition salt thereof.
    Type: Grant
    Filed: June 2, 1975
    Date of Patent: August 24, 1976
    Assignee: Riker Laboratories, Inc.
    Inventor: Alvin C. Conway
  • Multi-organ technetium complexes production and use thereof
    Patent number: 3976762
    Abstract: Chemical complexes, useful as radiopharmaceuticals, are formed by reacting technetium-99m with substituted or unsubstituted alkyl monophosphonic acids and certain ester derivatives thereof. The complexes are formed by reducing pertechnetate ion chemically or electrolytically in the presence of the phosphonic acid. By chemical modification of the phosphonic acid complexing agent, it is possible to "tailor" complexes for kidney, liver or bone imaging. The complexes are normally used in a physiologically acceptable aqueous medium.
    Type: Grant
    Filed: July 5, 1974
    Date of Patent: August 24, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Gunter A. Kohler, Gary M. Pestel
  • Surgical wire driving assembly
    Patent number: 3975032
    Abstract: A wire driving assembly for use as a surgical instrument engages a wire in rotating driving relation through a retainer which includes a passageway therethrough for passage of the wire. Cooperating with the retainer is a body member, the latter including a bore in which the retainer is received. Driving connection between the retainer and the wire is achieved by a tapered interior bore of the body member and cooperating engaging elements received in sets of apertures located along the length of the retainer and radially thereof. Each set of apertures is of a different diameter, the diameter of the set at the forward end of the retainer being the largest. Spherical elements are positioned in the apertures and move radially inwardly to a wire engaging position and radially outwardly to a wire releasing position.
    Type: Grant
    Filed: March 12, 1975
    Date of Patent: August 17, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: John H. Bent, Anthony Russo
  • Image transfer sheet material
    Patent number: 3975563
    Abstract: Sheet materials are provided which are useful in preparing negative transparencies for use with overhead projectors. Methods for obtaining image transfer and preparation of transparencies are also provided.
    Type: Grant
    Filed: May 8, 1974
    Date of Patent: August 17, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Victor R. Franer, Darrell C. Burman