Patents Represented by Law Firm Alexander, Sell, Steldt & DeLaHunt
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Patent number: 3939176Abstract: Magenta couplers of the 5-pyrazolone type which have a phenylcarbamylamino substituent in the 3-position of the pyrazolone nucleus and which have, as a substituent in the 1-position of the pyrazolone nucleus, a 2', 4'-dihalo-6'-alkoxyphenyl group or a 2', 6'-dihalo-4'-alkoxyphenyl group.Type: GrantFiled: July 22, 1974Date of Patent: February 17, 1976Assignee: Minnesota Mining and Manufacturing CompanyInventors: Mario Gandino, Paolo Beretta
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Patent number: 3937738Abstract: Perhaloalkanesulfenyl chlorides are reacted with aldehydes and ketones to provide novel (perhaloalkyl)thio-substituted aldehydes and ketones which are useful organic solvents and intermediates. As intermediates, these compounds are especially useful in the preparation of their carbamate derivatives which have pesticical utility.Type: GrantFiled: April 25, 1974Date of Patent: February 10, 1976Assignee: Minnesota Mining and Manufacturing CompanyInventor: James R. Throckmorton
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Patent number: 3937970Abstract: An optically transparent, essentially colorless radiation shielding material for high energy radiation contains a combination of lead or thallium salts of C.sub.1 to C.sub.5 organic acids and may contain lead or thallium salts of mineral acids. Shields of complex shapes are easily constructed.Type: GrantFiled: May 16, 1974Date of Patent: February 10, 1976Assignees: Theodore F. Bolles, Peter B. FlemingInventors: Theodore F. Bolles, Peter B. Fleming
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Patent number: 3937958Abstract: A charged particle beam (e.g., ions or electrons) apparatus including two electrostatic focusing lenses and an electrode having a diameter limiting aperture positioned between the lenses is further provided with two electrode assemblies which interact with an extractor electrode and with a source of charged particles such that the trajectories of the particles in the beam passing through the second of the two assemblies are substantially parallel. This feature and other disclosed improvements facilitate the production of a substantially monoenergetic beam which under a first set of conditions can be focused to provide a small-diameter, spherical-aberration limited beam and which under another set of conditions, can be focused to provide a high current beam.Type: GrantFiled: March 31, 1975Date of Patent: February 10, 1976Assignee: Minnesota Mining and Manufacturing CompanyInventors: Thomas W. Rusch, Jerry A. Sievers
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Patent number: 3938125Abstract: An antipilferage system utilizing markers comprising a sheet having both ferromagnetic and electrically conductive characteristics, which markers are detected upon passage through an interrogation zone within which are sequentially generated magnetic fields orthogonally disposed with respect to each other. The marker sheet is preferably a laminate of a ferromagnetic layer and a conductive metal layer, each of which layers exhibits a maximum sensitivity to fields perpendicular to each other. Interrogation of the markers by fields in three dimensions ensures the production of signal components associated with both characteristics of the marker regardless of the orientation of the marker upon passage through the zone. Accordingly, a highly reliable and false alarm free system is provided.Type: GrantFiled: February 20, 1974Date of Patent: February 10, 1976Assignee: Minnesota Mining and Manufacturing CompanyInventor: Dominic A. Benassi
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Patent number: 3935960Abstract: An easy opening, hermetically sealed container with a preformed aperture is covered by a tape closure having on its outer surface an indicator layer which changes color when flexed, thereby indicating whether the closure has been handled or tampered with.Type: GrantFiled: January 30, 1975Date of Patent: February 3, 1976Assignee: Minnesota Mining and Manufacturing CompanyInventor: Lew W. Cornell
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Patent number: 3935012Abstract: Photosensitive sheet material, containing an acid-cleavable adduct of an image-forming first reactant and a reaction inhibitor together with a photolyzable source of halogen acid, which upon exposure to a light-image liberates said first reactant for reaction with a second reactant to produce a visible image, contains a controlled small amount of an acid acceptor for reducing backgrounding and increasing contrast in the resulting print.Type: GrantFiled: July 12, 1973Date of Patent: January 27, 1976Assignee: Minnesota Mining and Manufacturing CompanyInventor: Gilbert L. Eian
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Patent number: 3935327Abstract: A method is disclosed for copying a graphic representation using a uniformly poled pyroelectric material.The uniformly poled pyroelectric material is selectively heated to form a differential charge pattern on the material. The differentially charged material can be used with charged toner particles to form a copy of the graphic representation using techniques well known in the art.Type: GrantFiled: August 6, 1973Date of Patent: January 27, 1976Assignee: Minnesota Mining and Manufacturing CompanyInventor: Allen L. Taylor
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Patent number: 3934065Abstract: A new retroreflective sheet material is taught that comprises a light-transmissive retroreflective open web of filaments that are individually encased by a monolayer of minute retroreflective microspheres, the web being ensheathed within an envelope that comprises two overlaid sheets joined together around the edge of the envelope, at least one of the sheets being transparent.Type: GrantFiled: August 1, 1973Date of Patent: January 20, 1976Assignee: Minnesota Mining and Manufacturing CompanyInventor: Chi Fang Tung
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Patent number: 3933494Abstract: Color contrast photographic images may be produced in a photographic element comprising:1. a base2. at least one layer of a silver halide photographic emulsion dispersed in a hydrophilic colloidal binder and reactively associated with at least one color coupler, and3. at least one hydrophilic colloidal binder receptive layer containing dispersed silver condensation nuclei for the formation of colored colloidal silver, reactively associated with said emulsion layer, said nuclei and coupler selected to give rise to substantially differing colorsBy developing said photographic element in the presence of a p-phenylene diamine developer and carrying agent for silver halide.Type: GrantFiled: November 8, 1973Date of Patent: January 20, 1976Assignee: Minnesota Mining and Manufacturing CompanyInventors: Vinicio Busatto, Luigi Franchi
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Patent number: 3933914Abstract: Dyes of the formula ##EQU1## WHEREIN R.sub.c is a monovalent chromophoric radical, M is a sulfonyl, carbonyl, or carbonyloxy bridging radical, R.sub.f is a monovalent saturated fluoroaliphatic radical, and R is a monovalent organic radical selected from cyano, MR.sub.f, or aryl sulfonyl. A wide spectrum of unusually brilliant colors is available.Type: GrantFiled: October 25, 1972Date of Patent: January 20, 1976Assignee: Minnesota Mining and Manufacturing CompanyInventors: Robert F. Coles, Ivan H. Skoog
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Patent number: 3934209Abstract: A transistorized amplifier includes an active network having a succession of DC coupled transistors, a load resistor across which an output voltage is developed in response to current flowing through the active network and a voltage divider network for distributing an applied DC potential equally across the active network. Each stage in the active network is thereby allowed to operate over only a restricted voltage range, while yet operating cooperatively to control high voltages, using inexpensive low voltage rating components. The amplifier preferably includes at least two sets of active networks, load resistors and voltage divider networks, each set being responsive to a complementary input signal current to provide complementary output voltages useful in driving a pair of electrostatic deflection plates.Type: GrantFiled: April 23, 1974Date of Patent: January 20, 1976Assignee: Minnesota Mining and Manufacturing CompanyInventors: Alastair Valentine, Richard L. Dennison
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Patent number: 3932293Abstract: Environmentally stable magnetic recording composition comprising fine metal particles based on iron, cobalt, or nickel, the particles having a chromium-based outer layer formed by exposing the particles to a solution containing dichromate or chromate ions under high-shear mixing conditions.Type: GrantFiled: August 28, 1974Date of Patent: January 13, 1976Assignee: Minnesota Mining and Manufacturing CompanyInventor: John S. Roden
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Patent number: 3932526Abstract: Fluoroaliphaticsulfonyl substituted ethylenes, useful as catalysts in polymerization of monomers, e.g., epoxide, vinyl ether, and N-vinyl monomers, are prepared by condensation of precursor fluoroaliphaticsulfonyl methanes with aldehydes or N-formyl compounds.Type: GrantFiled: October 25, 1972Date of Patent: January 13, 1976Assignee: Minnesota Mining and Manufacturing CompanyInventor: Robert J. Koshar
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Patent number: 3932109Abstract: An improved burner assembly, especially useful to heat a thermoelectric generator, comprising an ultrasonic atomizer for atomizing liquid fossil fuels into a mist of fine particles; baffle means for causing an appropriate mixture of fuel and air; and, usually, a mantle for uniformly distributing the heat of combustion over a cylindrical hot plate against which thermoelectric legs are disposed.Type: GrantFiled: March 11, 1974Date of Patent: January 13, 1976Assignee: Minnesota Mining and Manufacturing CompanyInventors: Edwin W. Pitcher, Thomas L. Nystrom
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Patent number: 3932401Abstract: The reaction product of a mixture of acrylic acid and methacrylic acid with tris (hydroxyalkyl) isocyanurates is found to have a reduced tendency to crystallize, making the reaction product especially useful in photopolymerizable compositions.Type: GrantFiled: January 31, 1974Date of Patent: January 13, 1976Assignee: Minnesota Mining and Manufacturing CompanyInventors: Carl John Berg, Edward John Deviny
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Patent number: 3932508Abstract: The compounds 1-trifluoromethylthio-3,3-dimethyl-2, butanone-O-methylcarbamoyloxime and 1-difluoromethylthio-3,3-dimethyl-2-butanone-O-methylcarbamoyloxime are prepared from certain novel ketone and oxime intermediates. These compounds have insecticidal activity and are particularly effective against the Western and Northern corn rootworms, Diabrotica virgifera and Diabrotica longicornis respectively.Type: GrantFiled: April 26, 1974Date of Patent: January 13, 1976Assignee: Minnesota Mining and Manufacturing CompanyInventor: James R. Throckmorton
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Patent number: 3931329Abstract: Condensation products of aldehydes and fluoraliphatic phenols are substantive to wool, synthetic polyamides, leather and skin, the compositions preferably being extended with a suitable pharmaceutical medium. The condensation products are useful for the preparation of compositions that render such materials oil and water repellent.Type: GrantFiled: January 23, 1974Date of Patent: January 6, 1976Assignee: Minnesota Mining and Manufacturing CompanyInventors: Leland S. Endres, Leo F. Gehlhoff, Dallas D. Zimmerman
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Patent number: 3930708Abstract: A solderless connector for making electrical contact with the closely spaced wires of a compact flat cable, wherein the contact elements comprise two coplanar sharpened flat outer prongs and a sharpened flat central prong parallel to, and displaced from the plane of, said outer prongs.Type: GrantFiled: September 9, 1974Date of Patent: January 6, 1976Assignee: Minnesota Mining and Manufacturing CompanyInventors: Albert D. Wedekind, John W. Benzer
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Patent number: 3930927Abstract: An apparatus is disclosed for dispensing discrete lengths of a double-coated adhesive tape onto a substrate. The device has a housing with one open side. An applicating drum with a plurality of flat applicating surfaces disposed about its circumference is rotatably mounted inside the housing near one end. A roll of double-coated adhesive tape is supported in the housing, the tape being pulled off the supply roll as the drum rotates. A base is attached to the housing extending along the open side of said housing and has an opening through which an applicating surface can pass. Means rotate the applicating drum upon movement of the housing toward and away from the base to bring an applicating surface bearing double-coated tape into an applicating position where the cutting means sever a short length of the double-coated tape and transfers the tape to a substrate.Type: GrantFiled: May 20, 1974Date of Patent: January 6, 1976Assignee: Minnesota Mining and Manufacturing CompanyInventors: Dorman N. Thompson, Aldon W. Haglund