Patents Assigned to I
  • Low attenuation, high strength optical fiber with silica filament core
    Patent number: 4116654
    Abstract: Low attenuation, high strength optical fiber is made by drawing a silica filament core at a temperature from 2040.degree. C. to 2140.degree. C. and melt coating onto it cladding polymer having an index of refraction lower than that of the silica core by extrusion at a draw-down ratio from 1.2 to 2.0.
    Type: Grant
    Filed: February 22, 1977
    Date of Patent: September 26, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Yves Michel Trehu
  • Water based alkyd resin primer
    Patent number: 4116904
    Abstract: An aqueous primer composition useful for priming substrates such as steel, polyester reinforced with fiberglass, acrylonitrile/butadiene/styrene plastics that are used in automobile and truck bodies and can be dried at ambient temperatures comprisesA binder of an alkyd resin which is the esterification product of drying oil fatty acids, an aromatic dicarboxylic acid, an anhydride of an aromatic tricarboxylic acid and a polyhydric alcohol such as an alkyd resin of soya oil fatty acids, phthalic acid, trimellitic anhydride and trimethylol propane;Pigments in a pigment to binder ratio of about 300/100 to 10/100; typical pigments are talc, barytes, and zinc/calcium molybdate; andAbout 0.05-1.0% by weight of an anionic polyelectrolyte dispersant; andA sufficient amount of ammonia or an amine such as triethyl amine to provide a pH of about 6.5 - 8.5.
    Type: Grant
    Filed: December 7, 1977
    Date of Patent: September 26, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Monica Harish Verma
  • Electrically curable, elastomeric sealing strip
    Patent number: 4117189
    Abstract: An uncured elastomeric sealing strip suitable for use in highway seals and comprising reinforcing carbon-black filled chlorosulfonated polyethylene in direct contact with two metal electricity conductors parallel to each other and running substantially the whole length of the strip. The elastomer is cured in place by heat generated within the composition when sufficient electric voltage is applied to the metal conductors.
    Type: Grant
    Filed: September 16, 1977
    Date of Patent: September 26, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Henry Joseph Stinger
  • Product and process
    Patent number: 4115989
    Abstract: Polyester yarn having the desirable crimp properties of false-twist textured, heat-set yarn is produced from melt-spun and drawn bicomponent filaments wherein poly(ethylene terephthalate) of 12 to 15 relative viscosity is one component and a copolyester of 23 to 26 relative viscosity, preferably poly(ethylene/2,2-dimethyl-1,3-propylene terephthalate) containing about 90 mole percent ethylene terephthalate units, is the other component. The bicomponent filaments are annealed at constant length to crystallize the polyethylene terephthalate component, forwarded in a jetted stream of heated compressible fluid, impinged in a plasticized condition against a moving screen, cooled and then taken up from the screen. The process can be operated continuously at high speeds, e.g., windup speeds of 3,000 to 4,000 meters per minute.
    Type: Grant
    Filed: May 2, 1977
    Date of Patent: September 26, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Jerzy Spolnicki
  • Catalytically active porous nickel electrodes
    Patent number: 4116804
    Abstract: An improved electrode having a porous nickel surface layer of greater than 75 microns in thickness and at least 11% in porosity is produced by a process which includes interdiffusing aluminum and nickel at a temperature of at least 660.degree. C. to form a nickel-aluminum alloy layer from which aluminum is subsequently selectively dissolved. When used as a cathode in an electrolytic cell for producing hydrogen, chlorine and caustic from brine, the improved electrode exhibits exceptionally low hydrogen overvoltage.
    Type: Grant
    Filed: November 17, 1976
    Date of Patent: September 26, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Christopher Roderick S. Needes
  • Pigmentary bright primrose yellow monoclinic bismuth vanadate and processes for the preparation thereof
    Patent number: 4115142
    Abstract: A pigmentary, bright primrose yellow monoclinic bismuth vanadate and processes for the preparation thereof by reacting bismuth nitrate with an alkali vanadate under controlled conditions to obtain a bismuth vanadate gel followed by aqueous digestion or calcination to produce pigmentary, bright primrose yellow monoclinic bismuth vanadate.
    Type: Grant
    Filed: May 9, 1977
    Date of Patent: September 19, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Richard William Hess
  • Centrifuge tube enclosure
    Patent number: 4114803
    Abstract: A vertically oriented centrifuge tube is placed in a rotor cavity or other enclosure, and the open end sealed with a tapered plug. A resilient shell-like cap is placed over the plug such that it is wedged between the plug and the tube. A retaining disc, secured to the open end of the enclosure, wedges the plug and cap into the open end of the centrifuge tube. The mouth of the enclosure is flared to accomodate the plug taper. Alternatively, the flare may be provided by an annular insert, for the cavity, whose interior is flared.
    Type: Grant
    Filed: December 17, 1976
    Date of Patent: September 19, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: William A. Romanauskas
  • Dust-free thermally stable lead chromate pigment composition and process of preparation
    Patent number: 4115143
    Abstract: Substantially non-dusting, thermally stable lead chromate pigment composition consisting essentially of lead chromate pigment and at least one organic ester selected from esters of phthalic and terephthalic acids and esters of fatty acids and process of preparation by forming a mixture of lead chromate pigment and water and intimately contacting the mixture with at least one organic ester. The lead chromate pigment composition can be poured, packaged, or otherwise processed in dry form with the formation of far less dust in the work environment than is encountered using conventional lead chromate pigment and exhibits high thermal stability in plastics.
    Type: Grant
    Filed: June 22, 1977
    Date of Patent: September 19, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Kenneth Batzar
  • Antistatic vinylidene chloride coating composition, and film coated therewith
    Patent number: 4115334
    Abstract: A vinylidene chloride copolymer coating composition containing small amounts of a polybasic acid of phosphorus, such as orthophosphoric acid, or sulfuric acid, in combination with a mono- or diglyceride. Organic polymeric films, such as polyester and regenerated cellulose films, coated therewith exhibit excellent antistatic properties. Such coated films can be run on various types of machinery without problems due to static build-up.
    Type: Grant
    Filed: May 20, 1977
    Date of Patent: September 19, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Clare William Gerow
  • Cathodic electrodeposition of paints
    Patent number: 4115227
    Abstract: A process for cathodic electrodeposition of paints wherein a layer of protective phosphate salt is initially deposited on a metal substrate followed by an amine-group-containing hydrophobic polymer which is preferably an acrylic-epoxy resin. The amounts of water and phosphoric acid in the deposited paint are very small.
    Type: Grant
    Filed: October 31, 1977
    Date of Patent: September 19, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Isidor Hazan
  • Protective package
    Patent number: 4114759
    Abstract: A package for protecting an object enclosed therein from mechanical shock comprising two sections having approximately vertical sidewalls. The sections are molded from a resiliently compressible material in two-part molds, the parting lines of which are located at about the midpoint of the section sidewalls.
    Type: Grant
    Filed: March 7, 1977
    Date of Patent: September 19, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: James Francis Maloney, Jr.
  • Process for treating zircon-containing foundry sand
    Patent number: 4115345
    Abstract: Process for treating zircon-containing foundry sand by intimately contacting the sand with an aqueous solution of an alkali metal silicate and isolating the sand from the solution. The treated sand is useful as the sand component of resin molds and cores.
    Type: Grant
    Filed: November 10, 1976
    Date of Patent: September 19, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: William Raymond Bushey
  • Organophosphine sulfides as photographic sensitizers
    Patent number: 4115129
    Abstract: Photographic colloid-silver halide emulsions are chemically sensitized by digestion at pH.gtoreq. 7 and the addition prior to or during digestion of at least one organophosphine sulfide of the general formula: ##STR1## WHEREIN (A) R is individually selected from the group consisting of hydrogen and a monovalent organic radical; m is 0, 1 or 2; and not more than one of said R's is hydrogen when m is 0; X represents a group having the formula: ##STR2## wherein Z is a divalent organic radical, n is 0 or 1, or (B) X.sub.m and R.sub.3-m together comprise a single trivalent heterocyclic radical.
    Type: Grant
    Filed: October 28, 1977
    Date of Patent: September 19, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: John Howard Bigelow
  • N-cyanoaziridines
    Patent number: 4115384
    Abstract: N-Cyanoaziridines containing the grouping ##STR1## are obtained by reacting an ethylenically unsaturated compound with cyanogen azide (N.sub.3 CN). Exemplary is 3-cyanoazatricyclo[3.2.1.0.sup.2.4 ] octane of the formula ##STR2## obtained by reacting norbornene with N.sub.3 CN.
    Type: Grant
    Filed: May 17, 1976
    Date of Patent: September 19, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Frank Dennis Marsh
  • Denture cleanser
    Patent number: 4115293
    Abstract: An improved denture cleanser composition comprising a thermogenic combination of oxidizing and reducing agents in conjunction with bleaching, pH adjustment, wetting and sequestering agents.
    Type: Grant
    Filed: April 7, 1977
    Date of Patent: September 19, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Daniel Schoenholz, Martin M. Perl
  • Process for the preparation of pigmentary bright primrose yellow bismuth vanadate
    Patent number: 4115141
    Abstract: Process for the preparation of pigmentary primrose yellow bismuth vanadate by reacting bismuth nitrate with an alkali vanadate under controlled conditions to obtain a bismuth vanadate gel which is then subjected to aqueous digestion to produce pigmentary monoclinic bismuth vanadate.
    Type: Grant
    Filed: May 9, 1977
    Date of Patent: September 19, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Douglas Howard Piltingsrud
  • Magenta triphenylmethane antihalation dyes for photographic elements
    Patent number: 4115126
    Abstract: Novel magenta dyes of the following structure ##STR1## where R.sub.1 and R.sub.2 = same or different lower alkyl (C.sub.1 -C.sub.5) groups, optionally substituted; wherein when R.sub.3 = a lower alkyl group, then R.sub.4 =--(CH.sub.2).sub.n CO.sub.2 H; and when R.sub.4 = hydrogen, then R.sub.3 = (CH.sub.2).sub.n CO.sub.2 H; where n = an integer from 1-4, and X is a salt-forming anion.These dyes are particularly useful in photographic elements comprising a support, a photosensitive silver halide layer, and a filter layer or antihalation layer containing an organic binder.
    Type: Grant
    Filed: January 27, 1977
    Date of Patent: September 19, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: George Crosier Whitney, III
  • Substituted 2-higher alkyl-3-hydroxy-1,4-naphthoquinone carboxylic acid esters and their use as miticides
    Patent number: 4115584
    Abstract: This invention relates to novel compounds which are represented by the following formula: ##STR1## wherein R.sub.1 is alkyl of 8-14 carbon atoms either branched, cyclic or straight chain; andR.sub.2 is alkyl of 1-17 carbon atoms either branched or straight chain, alkenyl of 2-17 carbon atoms, cycloalkyl of 3-6 carbon atoms, alkoxy of 1-4 carbon atoms, --CH.sub.2 OCH.sub.3, --CH.sub.2 OCH.sub.2 CH.sub.3 or --CH.dbd.CH--CO.sub.2 H;X is hydrogen, fluorine, chlorine, bromine, methyl or methoxy; andY is hydrogen, fluorine, chlorine, bromine, methyl or methoxy;Provided that at least one of X and Y is other than hydrogen.
    Type: Grant
    Filed: October 12, 1977
    Date of Patent: September 19, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Russell Frank Bellina, Dennis Lynn Fost
  • Fluoroelastomer blend composition
    Patent number: 4115481
    Abstract: A curable fluoroelastomer blend comprising:(a) 5-90 weight percent of a non-crosslinked fluoroelastomer comprising a copolymer of vinylidene fluoride and at least one other fluoroolefin, and(b) 10-95 weight percent of a partially crosslinked fluoroelastomer comprising a copolymer of vinylidene fluoride, at least one other fluoroolefin, and about 0.5-3.0 weight percent of bromotrifluoroethylene.
    Type: Grant
    Filed: September 16, 1977
    Date of Patent: September 19, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Joseph Burton Finlay, Hisanori Omura
  • Canopy device
    Patent number: 4112958
    Abstract: A canopy device, especially for aircraft bridges, adapted to cover between two through-openings which are orientable into alignment with one another and located each in one body the first one of which carries the canopy device and includes the first opening which is generally vertical, and the second body is a craft of varying shape, including the second opening. The canopy device has a front portion which is movable into engagement with the craft to provide a weatherproof passage between the openings. Protective pads are pivotally mounted to the side of the canopy facing the craft and the uppermost pad pivots in forward-downward direction due to gravity, whereupon the next pads will follow successively into engagement with the craft.
    Type: Grant
    Filed: May 6, 1977
    Date of Patent: September 12, 1978
    Assignee: Fabriksmontering i Trelleborg AB
    Inventor: Nils-Eric Anderberg