Patents Assigned to E
  • Polyimide articles of intermediate electrical conductivity and a process for making them
    Patent number: 4986946
    Abstract: A polymeric article having high temperature performance and intermediate electrical conductivity is disclosed. The article has a matrix of polyimide and a filler of conductive particulate material. The degree of conductivity is controlled by an extraction step in the manufacturing process.
    Type: Grant
    Filed: March 13, 1989
    Date of Patent: January 22, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Darrell J. Parish
  • Thermoplastic blends containing ethylene terpolymers and the preparation thereof
    Patent number: 4985497
    Abstract: Terpolymers of various amounts of polymer repeat units of ethylene, acrylate ester, and carbon monoxide are intimately admixed with acrylonitrile/butadiene/styrene (ABS) resin to form a blend with a flex modulus of at least 1700 MPa. The resulting blend has enhanced impact strength properties over the resin alone. Such blends are useful as molding resins. The process for preparation of the blend involves admixing the terpolymer with the ABS resin.
    Type: Grant
    Filed: August 25, 1988
    Date of Patent: January 15, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Kathryn A. Kamins, Robert J. Statz
  • Yarn finish applicator with internal finish heating capability
    Patent number: 4984440
    Abstract: A yarn finish applicator includes a body providing a yarn contact surface including a slot with two side walls and a bottom. A passage extends to the slot through the body member so that finish is supplied to the slot by flowing through the passage. Heating capability is provided in the body member for heating the finish as the finish flows to the yarn in the slot.
    Type: Grant
    Filed: December 5, 1989
    Date of Patent: January 15, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: James E. McCall
  • Shrinkable, conformable microwave wrap
    Patent number: 4985300
    Abstract: A heat shrinkable film is useful for packaging and for cooking a food item in a microwave oven is provided, which comprises a layer of flexible, heat resistant, microwave transparent base film which exhibits shrinkage of at least about 10% when heated unrestrained to 100.degree. C. for 5 seconds, and a layer of microwave susceptor material extending over the base film in an amount sufficient to cause the film to heat under microwave cooking conditions to provide browning or crisping of the food item.
    Type: Grant
    Filed: December 28, 1988
    Date of Patent: January 15, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Hua-Feng Huang
  • Aminomethyl oxooxazolidinyl cycloalkylbenzene derivatives useful as antibacterial agents
    Patent number: 4985429
    Abstract: Aminomethyl oxooxazolidinyl cycloalkylbenzene derivatives, such as l-N-[3-(2,3-dihydro-1-oxo-1H-inden-5-yl)-2-oxooxazolidin-5-ylmethyl]acetam ide, possess useful antibacterial activity.
    Type: Grant
    Filed: March 15, 1990
    Date of Patent: January 15, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Chia-Lin J. Wang, Mark A. Wuonola
  • Bipolar liquid electrostatic developer
    Patent number: 4985329
    Abstract: Bipolar liquid electrostatic developer consisting essentially of at least one charge director in a nonpolar liquid having dispersed therein two toner particles having opposite charge polarity which comprise at least one thermoplastic copolymer resin. The particle average by area size is less than 10 .mu.m. The ratio of the two toner particles is 5 to 95 and 95 to 5. A process of simultaneous transfer of such developer is included. The developer is useful in copying.
    Type: Grant
    Filed: December 30, 1988
    Date of Patent: January 15, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Lyla M. El-Sayed, Sanford M. Marcus, Torence J. Trout
  • Purification of hydrogen peroxide
    Patent number: 4985228
    Abstract: A method is disclosed for the purification of hydrogen peroxide by using activated carbon which has been chemically modified by using ammonium carbonate, (NH.sub.4).sub.2 CO.sub.3, or by using ethylenediaminetetraacetic acid diammonium salt, (NH.sub.4).sub.2 EDTA, followed by distillation.
    Type: Grant
    Filed: July 17, 1990
    Date of Patent: January 15, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Kirby Kirksey
  • Nonlinear optical device from 3-methyl-4-methoxy-4'-nitrostilbene
    Patent number: 4985178
    Abstract: A nonlinear optical element comprising 3-methyl-4-methoxy-4'-nitrostilbene useful for nonlinear optical and electro-optic effects.
    Type: Grant
    Filed: September 1, 1989
    Date of Patent: January 15, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Wilson Tam
  • Cutting torch
    Patent number: 4985610
    Abstract: A cutting device which includes an external tube, an internal tube disposed within the external tube, and a number of steel rods or wires housed within the internal tube. A squib, with or without additional fuel, is disposed within the external tube and adjacent to one end of the internal tube. A plurality of vent holes are provided on the periphery of the external tube to allow the combustion gases to exhaust therethrough. The vent holes are located away from the squib but adjacent to the end of the internal tube. One of the open ends of the external tube is sealed with a plug.
    Type: Grant
    Filed: August 15, 1989
    Date of Patent: January 15, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Klaus G. Rucker, Walter J. Simmons, Larry T. Stilwell
  • Process for preparation of electrophoresis
    Patent number: 4985128
    Abstract: Describes a process for controlling the polymerization and cross-linked density of electrophoretic gel products useful for separation of bioorganic molecules, which process does not use initiators common to processes of the art. Electron beam polymerized gels afford the desired advantages of being ultra thin and having a high electrophoretic resolution with programmable porosity profiles.
    Type: Grant
    Filed: January 9, 1990
    Date of Patent: January 15, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Richard C. Ebersole, Robert P. Foss
  • Amorphous copolymers of perfluoro-2,2-dimethyl-1,3-dioxole
    Patent number: 4985308
    Abstract: Articles made from amorphous dipolymers of perfluoro-2,2-dimethyl-1,3-dioxole with tetrafluoroethylene having high glass transition temperatures of 140.degree. C. or higher, low indices of refraction, and good physical properties, and low dielectric constants, include, among others, substrates for circuit boards, composites, sheets and films, optical lenses, and electronic current carrying devices.
    Type: Grant
    Filed: April 9, 1990
    Date of Patent: January 15, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Edward N. Squire
  • Mold fill coupling
    Patent number: 4984765
    Abstract: A mold fill coupling combined with a pinch fill valve and an overflow valve permits filling of a mold at one station and disconnecting the fill valve without rotating the mold.
    Type: Grant
    Filed: April 26, 1990
    Date of Patent: January 15, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: John L. Hannon, Jr.
  • Arrangement in an adjustable chair
    Patent number: 4984846
    Abstract: The invention relates to a device in a chair, especially an adjustable chair (1aa) having an articulation means (7) between a seat member (3) a back rest member (8a), so as to allow an alteration of the angular position therebetween, the alteration taking place by a pivoting said back rest member (8a) around a pivoting point (8) whilst said seat member (3) is displaced along a predetermined sliding path. The invention is characterized in that the device comprises one or more curved sliding means (1), the radius of curvature (R) of said sliding means (1) or the center (4) thereof being arranged in accordance with given functional properties of said chair (1aa), which in turn means that for example an increase of the tangential angle (.alpha.
    Type: Grant
    Filed: June 16, 1989
    Date of Patent: January 15, 1991
    Assignee: J. E. Ekornes A/S
    Inventor: Jostein Ekornes
  • Film box
    Patent number: 4984688
    Abstract: A packaging system for the protection and shipment of photographic film sheets comprises a box including a container and a cover adapted to close over an opening in the container. The container has a flexible tray element inserted within a rigid outer section of the container. The tray element and the cover have cooperative mating members disposed adjacent to the perimeter of the cover for tightly joining together respective surface portions thereof when the cover closes over the opening. The tray element also has an integral retaining lip for exerting pressure on film inserted within the tray element.
    Type: Grant
    Filed: July 14, 1989
    Date of Patent: January 15, 1991
    Assignee: E. I. Du Pont De Nemours & Co.
    Inventor: Joseph F. Mikulin
  • Coated large diameter oriented monofilaments
    Patent number: 4985304
    Abstract: Oriented polymeric monofilaments having a diameter of at least about 60 mils and excellent uniformity in roundness, and a process for their preparation by extrusion of the monofilament in at least two stages, orienting, and coating with a layer of unoriented polymer.
    Type: Grant
    Filed: December 22, 1989
    Date of Patent: January 15, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Teh-Chuan Wang
  • Copolyetherester elastomer with cycloaliphatic hard segments
    Patent number: 4985536
    Abstract: An improved thermoplastic, segmented, linear copolyetherester elastomer having hard segments derived from diols and diacids which provide divalent cyclo-aliphatic radicals having a structure depicted by a formula which is ##STR1## Preferably the diol and diacid radicals are each at least 40% trans isomer and either one or the other radical is at least 70% trans isomer. The elastomers are suited for use as rubber-band substitutes, elastic strips, elastic coatings and the like.
    Type: Grant
    Filed: June 7, 1990
    Date of Patent: January 15, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Garret D. Figuly
  • Process for preparing poly (paraphenylene terephthalamide) fibers dyeable with cationic dyes
    Patent number: 4985046
    Abstract: There is provided by this invention a process for preparing poly(paraphenylene terephthalamide) fibers dyeable with cationic dyes. The process comprises soaking poly(paraphenylene terephthalamide) fibers in sulfuric acid, washing the fibers and dipping the acid soaked fibers or never-dried PPD-T fibers in an aqueous solution of a dye promoting species. The fibers can then be dried and subsequently dyed.
    Type: Grant
    Filed: June 9, 1989
    Date of Patent: January 15, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Jon D. Hartzler
  • Acid catalysts for low temperature cure of coating compositions
    Patent number: 4985591
    Abstract: Preparation of a semi-crystalline catalyst for curing coating compositions wherein an isocyanate-sulfonate or -phosphonate is made by a Michael addition followed by chain extension with an isocyanate.
    Type: Grant
    Filed: August 15, 1988
    Date of Patent: January 15, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Jozef T. Huybrechts, Werner Zimmt
  • Branched polymers as fuel oil additives
    Patent number: 4985160
    Abstract: Oil soluble copolymers comprised of an addition-type polymeric main chain and a plurality of addition-type polymeric side branches which contain basic amine groups are disclosed which stabilize distillate fuel and lubricating oil compositions against deterioration during storage.
    Type: Grant
    Filed: February 8, 1989
    Date of Patent: January 15, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Cyrus P. Henry, Harry J. Spinelli
  • Processor chemistry control strip reader and replenishment system
    Patent number: 4985320
    Abstract: A voltage set point system is employed to provide a constant illumination of a photographic test strip. The set voltage is used as the supply for a voltage divider comparator network for accurately determining exposed film density levels.
    Type: Grant
    Filed: May 31, 1989
    Date of Patent: January 15, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Charles D. Griffin