Patents Assigned to E
  • Patent number: 4430418
    Abstract: A radiation-sensitive polyimide precursor composition, comprising a polymer of the formula ##STR1## wherein n is a positive integer corresponding to the number of units in the polymer and is sufficiently large to provide the polymer with a number average molecular weight of about 1500-15,000 as determined by vapor pressure osmometry, and wherein for any particular unit in the polymer:.fwdarw.denotes isomerism;R.sup.1 is a tetravalent aromatic non-halogen containing organic radical containing at least one ring of six carbon atoms, said ring characterized by benzenoid unsaturation, the four carbonyl groups being attached directly to separate carbon atoms in a ring of the R.sup.1 radical;R.sup.2 and R.sup.3 are selected from the group consisting of a hydrogen radical and any organic radical containing a photopolymerizable olefinic double bond, at least one of R.sup.2 and R.sup.3 being said organic radical;R.sup.4 and R.sup.
    Type: Grant
    Filed: September 30, 1982
    Date of Patent: February 7, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: David L. Goff
  • Patent number: 4429632
    Abstract: Improved uniformity of timing, and particularly reduced sensitivity of timing to minor variations in delay charge size, are achieved in delay detonators by placing a loose load of a flame-sensitive ignition composition between a pressed delay charge and an ignition assembly, e.g., a percussion primer, at the actuation end of the detonator. The loose ignition charge has a free surface and is adapted to be ignited in response to direct contact with flame emitted from the ignition of a charge in the ignition assembly. Preferably, the delay charge is pressed into a plastic carrier which, in a non-electric detonator, has an open end terminating between the walls of the detonator shell and a primer shell that closes the actuation end of the detonator, and the ignition charge is loosely loaded into a metal capsule seated against the delay charge.
    Type: Grant
    Filed: April 27, 1981
    Date of Patent: February 7, 1984
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Malak E. Yunan
  • Patent number: 4429714
    Abstract: A flow control valve having a flow-dividing cage surrounding its plug. The cage includes stacked plates spaced by dependent legs and annular screens in the spaces between adjacent plates.
    Type: Grant
    Filed: August 3, 1981
    Date of Patent: February 7, 1984
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventors: Allan B. Hughes, Terrence A. Dear
  • Patent number: 4430001
    Abstract: An apparatus and process for uniformly mixing a relatively small amount of material with a relatively large amount of another material in particulate form by introducing the smaller amount of material via a pipe within another concentric pipe through which a high pressure gas is introduced which thereby provides a zone of turbulence into which a particulate material in larger amounts is introduced, the mixture of gas and materials being transported through a treatment chamber to produce a uniform mixture.
    Type: Grant
    Filed: September 28, 1981
    Date of Patent: February 7, 1984
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: George A. Schurr
  • Patent number: 4430468
    Abstract: Filled thermoplastic compositions having enhanced elongation and useful, e.g., as sound-deadening sheeting for automotive carpet, are obtained by blending about 0-50% by weight of an ethylene interpolymer, such as ethylene/vinyl ester, ethylene/unsaturated mono- or dicarboxylic acids or esters of said unsaturated acids, etc.; 0-20% by weight of a plasticizer selected from the group consisting of processing oils, epoxidized oils, polyesters, polyethers, polyether esters and combinations thereof; about 40-90% by weight of filler; from about 0.05 to about 5.0% by weight of at least one surface active agent such as sulfonates, sulfates, phosphates, etc.; and optionally, modifying resins, such as tackifiers and certain ethylene and propylene homo- and copolymers.
    Type: Grant
    Filed: July 21, 1982
    Date of Patent: February 7, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Frederick G. Schumacher
  • Patent number: 4429055
    Abstract: An oxidation catalyst comprising boron phosphate impregnated with from 5 to 20 weight percent silver and its use to oxidize propylene, butene-1, butadiene-1,3 and methanol is disclosed. The oxidation takes place at from 200.degree. to 700.degree. C. Preferably water vapor is present.
    Type: Grant
    Filed: July 6, 1982
    Date of Patent: January 31, 1984
    Assignee: E. I. Du Pont de Nemours & Company
    Inventor: Velliyur Nott M. Rao
  • Patent number: 4429066
    Abstract: An additive for use in high solids coating compositions which is a blend of(1) colloidal silica,(2) a polymeric bridging agent,(3) an aromatic sulfonic acid, and(4) n-propyl amine;high solids coating compositions containing this additive have excellent shelf viscosity stability and finishes of such compositions and have excellent gloss and appearance and can be used as exterior finishes on automobiles and trucks.
    Type: Grant
    Filed: September 30, 1982
    Date of Patent: January 31, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Thomas C. Gilmer
  • Patent number: 4428539
    Abstract: An auxiliary drive used in conjunction with a yarn winding apparatus at the doffing location to maintain bobbin chuck speed during doff has a selectively operable brake to stop both the drive and the chuck.
    Type: Grant
    Filed: April 18, 1983
    Date of Patent: January 31, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Joshua Benin, Kenneth L. Mulholland, John F. Reichenberg
  • Patent number: 4429027
    Abstract: A simplified method for photoimaging a photosensitive layer produces in situ a radiation-opaque photomask on the photosensitive layer or on a cover sheet of the layer. A nonvisible latent image is toned and the toner is transferred to a layer or cover sheet to form an actinic radiation-opaque photomask.
    Type: Grant
    Filed: May 21, 1981
    Date of Patent: January 31, 1984
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventors: Vaughan C. Chambers, Jr., Joseph E. Gervay
  • Patent number: 4428700
    Abstract: A method is described for the confinement and isolation of waste materials, especially those that are toxic or otherwise hazardous such as radioactive wastes. The waste material, either contained or uncontained, is emplaced in a underground or surface excavation and encased with backfill or barrier material formed of molten modified sulfur cement or modified sulfur concrete that then cools into a hard, durable, corrosion resistant mass.
    Type: Grant
    Filed: August 3, 1981
    Date of Patent: January 31, 1984
    Assignee: E. R. Johnson Associates, Inc.
    Inventor: William L. Lennemann
  • Patent number: 4428323
    Abstract: A chamber block for a centrifuge has a sample inlet channel at the lower end of which is disposed a dam to prevent run-through of a sample, and barrier to prevent re-entry of supernatant from a supernatant collection vial into the block.
    Type: Grant
    Filed: November 22, 1982
    Date of Patent: January 31, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: John R. Wells
  • Patent number: 4429143
    Abstract: Perhalogenated dioxoles, halogenated dioxolanes, a process for making the dioxoles and dioxolanes, and polymers of dioxole and dioxolane monomers.
    Type: Grant
    Filed: September 28, 1981
    Date of Patent: January 31, 1984
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventors: Burton C. Anderson, David C. England, Paul R. Resnick
  • Patent number: 4428852
    Abstract: Ferromagnetic chromium dioxide is produced in a continuous operation by feeding a preheated paste of hydrated chromium oxides and additives into a twin screw reactor, reacting at elevated temperature and pressure for a short time while venting oxygen and steam, injecting water near the end of the reaction zone to form a viscous chromium dioxide-water mixture, and cooling while passing through a pressure letdown extruder.
    Type: Grant
    Filed: January 18, 1982
    Date of Patent: January 31, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Robert A. Covington, Jr., Cecil L. Long, David W. Williston
  • Patent number: 4428511
    Abstract: A fluid handling device of the rotary slot type is characterized by a fluid metering volume disposed in the stator of the device in close proximity to a fluid transfer passage formed in the stator. The metering volume receives a piston movable in a suction and a pumping stroke to draw fluid into the metering volume and to pump fluid therefrom. A rotary seal having the slot formed therein is received by seal rotating actuator such that a portion of a tab formed on the seal is accessible to permit removal of the seal from the rotating actuator.
    Type: Grant
    Filed: August 27, 1981
    Date of Patent: January 31, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Gary W. Howell
  • Patent number: 4429067
    Abstract: Use of a selected benzoate oligomer has been found to reduce mold deposits and to lower volatility without impairing crystallization rates of polyethylene terephthalate molding blends which contain an ionic hydrocarbon copolymer or ionic salt of a hydrocarbon acid, over polyethylene terephthalate blends which contained the ionic component and other additives.
    Type: Grant
    Filed: October 27, 1982
    Date of Patent: January 31, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Sumner A. Barenberg
  • Patent number: 4428724
    Abstract: Sheets of organic thermoplastic polymeric film are contacted with processing rolls having a microgrooved surface to reduce the air layer therebetween, thereby aiding heat transfer between film and roll and consequently increasing processing speed.
    Type: Grant
    Filed: September 29, 1981
    Date of Patent: January 31, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Stanley B. Levy
  • Patent number: 4427761
    Abstract: Process for modifying the tacky surface of a surprint multicolor proof having at least two nonplanar, nonsilver halide colored photoimaged elements bonded to a support and an outer photosensitive tacky layer whereby at least one particulate material, 0.1 to 20.mu. average particle size, having an oil absorbtivity of at least 30% by weight based on the weight of particulate material determined by Gardner-Coleman Method, ASTM D-1483-60 treated with at least 5% by weight of a transparentizing oil liquid having a boiling point greater than 100.degree. C. whereby the treated particulate material is applied to the tacky surface and the excess material is removed. The proofs obtained are excellent matches to press proofs on various surfaces.
    Type: Grant
    Filed: December 2, 1982
    Date of Patent: January 24, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Magalie M. Charles
  • Patent number: 4427693
    Abstract: 4,5-Diaryl-.alpha.,.alpha.-bis(polyhalomethyl)-2-thiophene-methanamines, such as 4,5-bis(4-fluorophenyl)-.alpha.,.alpha.-bis-(trifluoromethyl)-2-thiophenem ethanamine, useful for treating arthritis and/or alleviating pain.
    Type: Grant
    Filed: November 2, 1981
    Date of Patent: January 24, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Stephen B. Haber
  • Patent number: 4427737
    Abstract: A breathable tape comprising a porous backing layer and a microporous adhesive layer. The adhesive layer includes a rubbery elastomer, one or more water soluble or swellable hydrocolloids, and other optional substances and has a porosity of from about 1 to about 100 cc/sec/in.sup.2.
    Type: Grant
    Filed: April 23, 1981
    Date of Patent: January 24, 1984
    Assignee: E. R. Squibb & Sons, Inc.
    Inventors: Rudolfo D. Cilento, Charles Riffkin, Anthony L. LaVia
  • Patent number: 4426794
    Abstract: A device for treating textiles, such as laundry, for example cleaning and drying, mainly comprising a closed housing 1 having openings 5, 6 being pneumatically closable for inserting and taking out respectively the laundry, a shaft 2 driven by 4 and rotatably journalled in said housing 1 and a drum supported by the shaft 2 and to be rotated for receiving the laundry, said drum consisting of at least two sections 7 axially displaceable through a roller or slide element 11 along a wing-like carrier 10 fastened to said shaft 2. In the carrier 10 tensioning means are provided for in order to tension said sections 7 during washing and centrifuging.
    Type: Grant
    Filed: November 2, 1981
    Date of Patent: January 24, 1984
    Assignee: E. M. D'Hooge N.V.
    Inventor: Herman E. C. Vanderheijden