Patents Assigned to E
  • System for the production of dot-etched lithographic films
    Patent number: 4973543
    Abstract: A system for the preparation of dot etched lithographic films, consisting essentially of a light sensitive silver halide material for tanning development and an etching solution, in which system the light sensitive material of various layers contains at least one colorant, e.g., pigment or dye with acid groups, which is stable in the processing baths and forms with bases salts soluble in organic solvents, and the etching solution contains a base that ionizes the colorant, and a solvent for the resulting ion pair.
    Type: Grant
    Filed: August 18, 1988
    Date of Patent: November 27, 1990
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Ruger Reinhold
  • Halogenated 1,3-dioxolanes and derivatives
    Patent number: 4973714
    Abstract: There are disclosed halogenated dioxolanes of a specified formula, dioxoles made therefrom, polymers of the dioxoles, and processes for making the dioxolanes.
    Type: Grant
    Filed: November 22, 1988
    Date of Patent: November 27, 1990
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Carl G. Krespan
  • Ostomy coupling
    Patent number: 4973324
    Abstract: An ostomy coupling has a first channel shaped element for attachment to an ostomy bag and a second element for attachment to a pad of medical grade adhesive. Each of these elements surrounds a stomal orifice. The second element is made into parts. The first attaches to the pad and the second is slidable axially relative to the first part. Moreover, the second part has a flange under which fingers can be placed when joining the elements to substantially prevent the application of pressure to the peristomal area.
    Type: Grant
    Filed: March 6, 1989
    Date of Patent: November 27, 1990
    Assignee: E. R. Squibb & Sons, Inc.
    Inventor: Peter L. Steer
  • Peroxide-curable fluoroelastomers having bromine an iodine curesites and the preparation thereof
    Patent number: 4973633
    Abstract: Peroxide-curable fluoroelastomers are prepared in the presence of iodinated compounds, with iodine bonding to a substantial number of terminal positions on the fluoroelastomer, and comprising up to 3 weight percent of bromine-containing units selected from fluoroolefins and perfluoroalkyl perfluorovinyl ethers, and complementally at least 97 weight percent of either units of vinylidene fluoride, one or more fluoroolefins, and optionally perfluoroalkyl perfluorovinyl ethers, or units of tetrafluoroethylene, perfluoroalkyl perfluorovinyl ether, and ethylene. The resulting fluoroelastomers have improved processability, excellent strength and compression set properties, and are useful in the preparation of injection molded shaft seals, gaskets and other molded parts. The fluoroelastomer is prepared by a continuous emulsion polymerization process.
    Type: Grant
    Filed: May 15, 1989
    Date of Patent: November 27, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Albert L. Moore
  • Thermoplastic copolyester elasatomer binder for oxidizer particles
    Patent number: 4973658
    Abstract: A polymer which is useful as a thermoplastic rubbery binder for oxidizer particles, such as HMX and RDX, for the preparation of low vulnerability gun propellants is provided by a segmented thermoplastic copolyester elastomer consisting essentially of a multiplicity of recurring intralinear long chain and short chain ester units connected head-to-tail through ester linkages, said long chain ester units being represented by a structure selected from the following group consisting of: ##STR1## and said short chain ester units being represented by the following structure: ##STR2## wherein: G is a divalent radical remaining after removal of terminal hydroxyl groups from a poly(alkylene oxide) glycol having a carbon-to-oxygen ratio of about 2.0-4.
    Type: Grant
    Filed: September 16, 1988
    Date of Patent: November 27, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Guenther K. Hoeschele
  • Chlorofluorohydrocarbon purification process
    Patent number: 4973774
    Abstract: Chlorofluorohydrocarbons contaminated with unwanted isomers during the process for their manufacture are purified by reacting the mixture with alcohol solutions of alkali metal and then separating the ether derivatives of the isomers from the mixture.
    Type: Grant
    Filed: November 2, 1989
    Date of Patent: November 27, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Shlomo M. Rozen, Bruce E. Smart
  • Catalytic hydrogenation of carboxylic anhydrides to esters or lactones
    Patent number: 4973713
    Abstract: A process for the production of esters or lactones, comprising reacting in the presence of a catalyst and under hydrogenation conditions hydrogen and an acyclic or cyclic carboxylic anhydride to produce the corresponding ester or lactone, wherein the catalyst is a supported catalyst comprising:(a) a group VIII metal, Re and Fe;(b) a group VIII metal on TiO.sub.2 ;(c) Ru and at least one of Re, Ag or Cu; or(d) Pd and Fe.Preferably, the anhydride has the formula ##STR1## and is reacted to form an ester of the formula ##STR2## or a lactone of the formula ##STR3## wherein R and R.sup.1 independently are lower alkyl or cycloalkyl; R.sup.2, R.sup.3, R.sup.4, R.sup.5 independently are hydrogen, lower alkyl, cycloalkyl or aryl; and wherein R.sup.3 and R.sup.4 taken together may form a saturated or unsaturated ring, or an aromatic ring. The more preferred starting material is phthalic anhydride.
    Type: Grant
    Filed: November 28, 1989
    Date of Patent: November 27, 1990
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: William H. Manogue
  • Production of tetrafluoroethylene
    Patent number: 4973773
    Abstract: Preparation of high yields of tetrafluoroethylene by preferably contacting pentafluoroethane and/or trifluoromethane with hot gas, preferably argon (.gtoreq.2000.degree. K.) followed by rapid cooling of the reaction mixture, in less than one second, i.e., 0.001 to 0.1 second, to a temperature .gtoreq.800.degree. K.
    Type: Grant
    Filed: March 21, 1989
    Date of Patent: November 27, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Brian S. Malone
  • Oligomeric semicarbazide additives for spandex
    Patent number: 4973618
    Abstract: Oligormeric polyether/urethanes with semicarbazide end-groups protect spandex fibers from discoloration in atmospheric fumes and/or light. The oligomers are prepared from polyether glycols, diisocyanates and N,N-dialkylhydrazine.
    Type: Grant
    Filed: September 29, 1989
    Date of Patent: November 27, 1990
    Assignee: E. I. Du Pont de Nemours & Company
    Inventor: Arnoldus J. Ultee
  • Plastic composite barrier structures
    Patent number: 4973625
    Abstract: Composite moisture and oxygen barrier structures in the form of films, sheets, tubes and bottles are described which are composed of foils of high density polyethylene and foils of polar oxygen barrier resins adhered to each other with a coextruded bonding resin composition composed of blends of predominantly high density polyethylene containing low levels of a grafted unsaturated dicarboxylic acid anhydride and linear low density polyethylenes which are copolymers of ethylene with either octene-1 or butene-1. The preferred dicarboxylic acid anhydride is maleic anhydride. The oxygen barrier resins are preferably ethylene/vinyl alcohol copolymers or amorphous polycarboxylamides from condensation polymerization of aliphatic diamines and aromatic dicarboxylic acids.
    Type: Grant
    Filed: September 23, 1987
    Date of Patent: November 27, 1990
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Edward J. Deyrup
  • Fiber from polyether-based spandex
    Patent number: 4973647
    Abstract: An improved spandex fiber is provided that is particularly useful for use in tricot-knit fabrics with nylon yarns. The fiber is formed from a polyether-based spandex polymer made from a poly(tetramethylene ether) glycol of about 2,200 molecular weight which was capped with methylene-bis(4-phenylisocyanate) and the resultant product then chain extended with a diamine mixture of ethylene diamine and 2-methyl-1,5-pentanediamine in a molar ratio of about 70/30.
    Type: Grant
    Filed: May 31, 1989
    Date of Patent: November 27, 1990
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Donald D. Bretches, Steven P. Pardini
  • Process for preparing 3-hydroxy 2-keto acids
    Patent number: 4973747
    Abstract: A process has now been discovered by which an intermediate in preparation of antibiotics ##STR1## may be directly derived from the substrate ##STR2## by treatment with aqueous solutions of MHCO.sub.3 and MOH, wherein: R.sup.1, R.sup.2 and R.sup.3 are each independently alkyl, alkenyl, alkynyl, substituted alkyl, substituted alkenyl, substituted alkynyl, aryl, or substituted aryl;M is alkali metal (such as Na, Li, or K); andX is halogen.
    Type: Grant
    Filed: August 15, 1989
    Date of Patent: November 27, 1990
    Assignee: E. R. Squibb & Sons, Inc.
    Inventors: Janak Singh, Richard H. Mueller
  • Osmotic method for determining the molecular weight of solutes in solution with a solvent
    Patent number: 4972701
    Abstract: There is disclosed apparatus and method for determining molecular weight by osmometry. A fluid circuit is used having two pressure measurement zones, one responsive only to viscosity effects and the other to both viscosity and osmotic effects. The osmotic effects are caused by cross-linked polymeric material within one zone capable of expanding and contracting in response to the presence of a solvent and a solution, respectively, thereby changing the effective radius of the zone and hence the pressure.
    Type: Grant
    Filed: August 31, 1989
    Date of Patent: November 27, 1990
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Wallace W. Yau
  • Laminar articles made from mixtures of a polyolefin and ethylene/vinyl alcohol copolymers
    Patent number: 4971864
    Abstract: A laminar article is provided, comprising a combination of a polyolefin, an ethylene-vinyl alcohol copolymer having a melting point at least about 5.degree. C. higher than the polyolefin, and a compatibilizer of a compatible polyolefin backbone grafted with cyclic anhydride moieties, wherein the ethylene-vinyl alcohol copolymer is present within the polyolefin as multiple, thin, substantially parallel, overlapping layers.
    Type: Grant
    Filed: May 15, 1989
    Date of Patent: November 20, 1990
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Elizabeth F. McCord
  • Cyano-containing perfluoropolymers having iodine curesites
    Patent number: 4972038
    Abstract: Perfluoropolymers prepared from tetrofluoroethylene, perfluro (alkyl vinyl) ether and cyano-cure site monomer, and further comprising iodo moieties, and cured elastomers prepared from the perfluoropolymers.
    Type: Grant
    Filed: May 19, 1989
    Date of Patent: November 20, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Anestis L. Logothetis
  • Self inking hand stamp
    Patent number: 4970954
    Abstract: A hand operated stamp with two slidable housings, one inside the other, adapted to compress springs when slid together and also to rotate a stamp die from an ink pad contacting position inside the inner housing to an imprint positioin at the bottom of the inner housing. The compression springs are attached to and removable with a cap on the outer housing to save space and allow easy replacement of the ink pad.
    Type: Grant
    Filed: January 9, 1990
    Date of Patent: November 20, 1990
    Assignee: Richard E. Hewitt
    Inventors: David A. Weir, Richard E. Hewitt
  • Element containing lower gloss protective covering and a pre-press color proof
    Patent number: 4971893
    Abstract: Method of providing an image-bearing surface, e.g., a pre-press proof, with a protective covering, comprising laminating to said surface a thin, substantially transparent integral polymeric film, the improvement wherein the polymeric film consists essentially of a mixture of at least two slightly incompatible polymers, whereby the film exhibits a 20.degree. specular gloss that is at least 5% lower than the gloss of a film prepared from any one of said polymer constituents.
    Type: Grant
    Filed: February 14, 1990
    Date of Patent: November 20, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Harvey W. Taylor, Jr.
  • Scanning laser microscope system and methods of use
    Patent number: 4972258
    Abstract: A scanning laser microscope system for assisting in the detection and characterization of fine details and structures of materials or other samples. The system can have means for enhancing light from the material to assist detection of anomalies, such as inclusions in the material and crystal lattice dislocations. The system can have means for enhancing fluorescent light emitted from the sample. The system can further have very precise means for processing signals representative of light detected from the material.
    Type: Grant
    Filed: July 31, 1989
    Date of Patent: November 20, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: William E. Wolf, Alfred Hirschle, Derrick P. Lattibeaudiere, Robert H. Livermore, Alan P. Stamford, John Taylor
  • Chlorinated terpolymers of ethylene
    Patent number: 4972026
    Abstract: A chlorinated terpolymer of a precursor terpolymer containing 3-20 weight percent acrylic acid or methacrylic acid, 3-20 weight percent vinyl acetate and 60-90 weight percent ethylene contains 20-60 weight percent chlorine and has a Brookfield viscosity of about 150-600 cP when measured at 25.degree. C. in xylene solution at a concentration of 25% by weight chlorinated terolymer. The chlorinated terpolymer contains 20-60 and preferably 25-55 weight percent chlorine.
    Type: Grant
    Filed: November 25, 1988
    Date of Patent: November 20, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Adrian R. Armstrong, James W. Dawes
  • Metal alkoxide modified resins for negative-working electrostatic liquid developers
    Patent number: 4971883
    Abstract: Negative-working electrostatic liquid developer consisting essentially of(A) nonpolar liquid having Kauri-butanol value less than 30, present in major amount,(B) particles, average by area particle size of less than 10 .mu.m, of a polymer prepared from the reaction product of polymeric resin having free carboxyl groups and a metal alkoxide as defined, and(C) nonpolar liquid soluble ionic or zwitterionic charge director compound.Optionally a colorant and an adjuvant compound are present. Process of preparation of electrostatic liquid developers is described. The developer is useful in copying, making proofs including digital color proofs, Lithographic printing plates, and resists.
    Type: Grant
    Filed: September 25, 1989
    Date of Patent: November 20, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Dominic M. Chan, Torence J. Trout