Patents Assigned to E
  • Method for the detection or quantitation of an analyte using an analyte dependent enzyme activation system
    Patent number: 5196306
    Abstract: The present invention concerns a method to catalyze reporter deposition to improve detection or quantitation of an analyte in a sample by amplifying the detector signal which comprises reacting an analyte dependent enzyme activation system with a conjugate consisting of a detectably labeled substrate specific for the enzyme system, said conjugate reacts with the analyte dependent enzyme activation system to form an activated conjugate which deposits substantially wherever receptor for the activated conjugate is immobilized, said receptor not being reactive with the analyte dependent enzyme activation system. In another embodiment the invention concerns an assay for detecting or quantitating the presence or absence of an analyte in a sample using catalyzed reporter deposition to amplify the reporter signal.
    Type: Grant
    Filed: September 28, 1990
    Date of Patent: March 23, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Mark N. Bobrow, Gerald J. Litt
  • Functionalized trifluorovinyl ethers and polymers therefrom
    Patent number: 5196569
    Abstract: Trifluorovinyl ethers containing selected functional groups, and homo- and copolymers prepared from them, are disclosed, as well as intermediates useful in the preparation of the ethers.
    Type: Grant
    Filed: October 10, 1991
    Date of Patent: March 23, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Ming-Hong Hung
  • N-sulfenylated pyrazolines, compositions and use
    Patent number: 5196408
    Abstract: N-sulfenylated and N-acrylated pyrazoline arthropodicides, compositions containing them and methods for controlling arthropods by applying compounds of the invention to them or to their environment. The pyrazolines are selected from those of Formulae I to III wherein R.sub.1, R.sub.2, R.sub.
    Type: Grant
    Filed: March 12, 1991
    Date of Patent: March 23, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Mohamed A. H. Fahmy, deceased, Charles R. Harrison, George P. Lahm, Thomas M. Stevenson
  • Method for electronic color processing
    Patent number: 5196927
    Abstract: The present invention relates to a method for adjusting original color signal values for n colors in a color separation system and, more particularly, to a computer implemented method for adjusting the original values based on color interaction.
    Type: Grant
    Filed: March 16, 1990
    Date of Patent: March 23, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: George T. Warner
  • Living cationic polymerization of alkyl vinyl ethers
    Patent number: 5196491
    Abstract: This invention relates to a process for the living cationic polymerization of vinylic unsaturated compounds containing electron donating substituents resulting in polymers of narrow molecular weight distribution.
    Type: Grant
    Filed: November 25, 1988
    Date of Patent: March 23, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Chang Cho, Ben-Ami Feit, Owen W. Webster
  • Azeotropic composition of 1,1,1,2,3,4,4,5,5,5-decafluoropentane and trans-1,2-dichloroethylene, cis-1,2-dichloroethylene or 1,1-dichlorethane
    Patent number: 5196137
    Abstract: Azeotropic mixtures of 1,1,1,2,3,4,4,5,5,5-decafluoropentane (HFC-43-10mee) and trans-1,2-dichloroethylene, cis-1,2-dichloroethylene or 1,1-dichloroethane are useful as cleaning agents, expansion agents for polyolefins and polyurethanes, refrigerants, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, power cycle working fluids, polymerization media, particulate removal fluids, carrier fluids, buffing abrasive agents, and displacement drying agents.
    Type: Grant
    Filed: October 1, 1991
    Date of Patent: March 23, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Abid N. Merchant
  • Ostomy device with improved coupling system
    Patent number: 5195996
    Abstract: In the first embodiment, the faceplate coupling ring is of conventional design and includes an axially extending rib with a radially outwardly extending rim and a radially inwardly extending deflectable sealing strip. The pouch coupling ring includes inner and outer spaced walls, forming a channel for receiving the rib. First and second protrusions extend inwardly from points on the interior surface of the walls proximate the ends thereof. The first protrusion cooperates with the rim and the second protrusion cooperates with the tip of the sealing strip, to securely retain the rib within the channel. The walls of the channel have reduced thickness and are easily deflectable as the rib is inserted into the channel, such that coupling of the rings is facilitated but decoupling requires the conventional amount of force due to the second protrusion.
    Type: Grant
    Filed: January 9, 1991
    Date of Patent: March 23, 1993
    Assignee: E. R. Squibb & Sons
    Inventors: John V. Edwards, Walter F. Leise, Jr., John B. Cline
  • Apparatus and method for the generation of modulated optical signals using a semiconductor laser
    Patent number: 5197075
    Abstract: A system for the generation of modulated optical signals, wherein to the d.c. bias current of a semiconductor laser (1) associated with an opto-electronic feedback circuit (2) including a delay, there are superimposed the variations of a current obtained by detecting an optical signal resulting from the combination of an optical, amplitude-modulated input signal and of the optical signal present in the feedback circuit. By a suitable choice of the modulation frequency (f2) of the input signal and of the low-frequency gain (B) of the feedback loop (2), the laser output signal is amplitude-modulated at a frequency equal to the modulation frquency (f2) of the input signal.
    Type: Grant
    Filed: December 10, 1991
    Date of Patent: March 23, 1993
    Assignee: Cselt - Centro Studi e Laboratori Telecomunicazioni S.p.A.
    Inventors: Fortunato T. Arecchi, Massimo Calzavara, Giovanni Giacomelli
  • Tetrapolyimide film containing benzophenone tetracarboxylic dianhydride
    Patent number: 5196500
    Abstract: Tetrapolyimide films derived from 3,3',4,4'-benzophenone tetracarboxylic dianhydride, pyromellitic acid dianhydride, p-phenylene diamine and 4,4'-diaminodiphenyl ether, and their preparation, are described. The tetrapolymer films have low water absorption, low coefficients of thermal and hygroscopic expansion, high modulus and are caustic etachable and can be used in flexible printed circuit and tape automated bonding applications.
    Type: Grant
    Filed: December 17, 1990
    Date of Patent: March 23, 1993
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: John A. Kreuz, Richard F. Sutton, Jr., Stuart N. Milligan
  • Cleaning composition of hydrocarbon component, surfactant and multibasic ester additive
    Patent number: 5196136
    Abstract: A cleaning composition is disclosed which is suitable for cleaning substrates and particularly for cleaning flux residues from a printed circuit board. The cleaning composition comprises a hydrocarbon component, a compatibilizing agent, a multibasic ester additive, and optionally water. The multibasic ester may be an alkanoic acid ester of a diol or polyol, an alkanoic acid ester of a hydroxy alkanoate alkyl ester, or and alkyl ester of a compound containing two or more carboxylic acid groups and one or more hydroxyl groups which are optionally esterified with an alkanoic acid group. The cleaning composition may be used as a solution or as an emulsion or dispersion to clean a substrate.
    Type: Grant
    Filed: June 20, 1991
    Date of Patent: March 23, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Kenneth T. Dishart, Harold L. Jackson, Abraham B. Cohen, deceased
  • Process for separating and recovering fluorocarbons and hydrogen fluoride from mixtures thereof
    Patent number: 5196616
    Abstract: A process for separating and recovering an organic phase (e.g., fluorocarbons such as chlorofluorocarbons, hydrochlorofluorocarbons, hydrofluorocarbons and perfluorocarbons) from a feed stream of a mixture of fluorocarbons and hydrogen fluoride, wherein the mixture is characterized as forming at least one azeotrope or azeotrope-like composition involving at least one fluorocarbon and hydrogen fluoride, by passing the fluorocarbon/HF mixture feed stream through the feed side of a semipermeable membrane unit and then further separating a fluorocarbon-depleted hydrogen fluoride permeate stream and a fluorocarbon enriched residual stream exiting the membrane unit by conventional distillation. An essentially pure fluorocarbon phase and hydrogen fluoride phase are recovered from the distillation with the azeotrope or azeotrope-like distillate being recycled to the inlet of the semipermeable membrane unit.
    Type: Grant
    Filed: October 18, 1991
    Date of Patent: March 23, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Kung H. Lee, Domenic J. Barsotti, Edward K. Sakata
  • Catalyzed hydrofluorination halogenated alkanes
    Patent number: 5196615
    Abstract: Process for the preparation of fluorinated alkanes by contacting halogenated alkanes with HF in the presence of TaCl.sub.5 or TaBr.sub.5.
    Type: Grant
    Filed: August 22, 1990
    Date of Patent: March 23, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: V. N. Mallikarjuna Rao
  • Hydroxy containing fluorovinyl compounds and polymers thereof
    Patent number: 5196494
    Abstract: Novel hydroxy containing fluorovinyl ethers, polymers of hydroxy containing fluorovinyl ethers, copolymers of selected hydroxy containing fluorovinyl ethers, a process for reducing ester containing fluorovinyl compounds to the corresponding alcohol with borohydrides, and a process for polymerizing hydroxy containing fluorovinyl ethers are disclosed.
    Type: Grant
    Filed: December 4, 1991
    Date of Patent: March 23, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Ming-Hong Hung
  • Process for modifying visosity of ethylene copolymers
    Patent number: 5194516
    Abstract: The viscosity of copolymers of a) ethylene and C.sub.1 -C.sub.8 acrylate or methacrylates or b) ethylene, vinyl esters of C.sub.1 -C.sub.4 carboxylic acids, and another comonomer selected from the group consisting of carbon monoxide, acrylic acid, methacrylic acid, or a glycidyl ester of acrylic or methacrylic acid is increased, while maintaining gel content at a level of less than 3%, by treatment with a free radical generating agent.
    Type: Grant
    Filed: October 1, 1991
    Date of Patent: March 16, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: John R. Fisher, Jerald R. Harrell, Wolfgang Honsberg, John W. Paul
  • Molten salt electrolytic beneficiation of iron oxide-containing titaniferous ores to produce iron and high-grade TiO.sub.2
    Patent number: 5194124
    Abstract: Disclosed is a process for beneficiating titaniferous material which contains iron oxide. The titaniferous material is mixed with a molten salt or mixture or molten salts in which iron oxide dissolves to produce iron ions and oxyanions. The iron ions are electrolytically reduced to iron at the cathode and deposited as high purity iron on the cathode. The oxyanions react with a carbonaceous anode to generate CO and/or CO.sub.2. A beneficiated TiO.sub.2 product is recovered from the molten salt or mixture of molten salts.
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: March 16, 1993
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Kevin J. Leary
  • Chlorosulfonated polyolefin-modified polyurethane and polyurea compositions and process for making same
    Patent number: 5194505
    Abstract: A chlorosulfonated olefin polymer resin composition comprising the reaction product of:a) 1-80% by weight, based on the weight of the resin, of a chlorosulfonated olefin polymer having a chlorine content of about 20-60% by weight and a sulfur content of about 0.5-10% by weight;b) 5-90% by weight, based on the weight of the resin, of a compound selected from the group consisting of polyols, hydrocarbon primary and secondary polyamines, condensation products of said polyamines with aliphatic, cycloaliphatic, or aromatic polycarboxylic acids, and mixtures thereof, wherein the equivalent ratio of the compound to sulfur in the chlorosulfonated olefin polymer is greater than 1:1 and the compound has an equivalent weight up to 5,000; andc) at least 5% by weight, based on the weight of the resin, of a polyisocyanate;is disclosed as well as the process for making same.
    Type: Grant
    Filed: November 8, 1991
    Date of Patent: March 16, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Edward G. Brugel
  • Structure and method of manufacture of an implantable microstimulator
    Patent number: 5193540
    Abstract: An implantable microstimulator has a structure which is manufactured to be substantially encapsulated within a hermetically-sealed housing inert to body fluids, and of a size and shape capable of implantation in a living body, by expulsion through a hypodermic needle. The internal structure of the microstimulator comprises a coil adapted to function as the secondary winding of a transformer and receive power and control information. Circuit means, including control electronics, a capacitor and electrodes are provided. The electrodes, which may be made one of iridium and the other of tantalum and placed on opposite ends of the microstimulator, or alternatively, an iridium electrode at each end of the microstimulator, are at least partially exposed and provide electrical, stimulating pulses to the body.
    Type: Grant
    Filed: December 18, 1991
    Date of Patent: March 16, 1993
    Assignee: Alfred E. Mann Foundation for Scientific Research
    Inventors: Joseph H. Schulman, Gerald E. Loeb, John C. Gord, Primoz Strojnik
  • Process for making fluoropolymer composites
    Patent number: 5194484
    Abstract: A novel process for making fluoropolymer-fiber composites is disclosed, which produces composites with improved physical properties. The composites are useful in parts that require chemical and/or thermal stability, as in chemical process equipment.
    Type: Grant
    Filed: September 25, 1991
    Date of Patent: March 16, 1993
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Anestis L. Logothetis
  • Barrier blends based on amorphous polyamide and ethylene/vinyl alcohol, unaffected by humidity
    Patent number: 5194306
    Abstract: A blend consisting essentially of a major portion of an amorphous polyamide and a minor portion of an ethylene vinyl alcohol copolymer exhibits gas barrier properties which are less dependent on humidity than are those of either of the component polymers. Films and laminated structures which incorporate the material of these blends are suitable for use as packaging materials.
    Type: Grant
    Filed: January 29, 1992
    Date of Patent: March 16, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Philip S. Blatz
  • Self supporting above ground swimming pool
    Patent number: D334238
    Type: Grant
    Filed: December 11, 1990
    Date of Patent: March 23, 1993
    Assignee: Agrisilos dei F.LLI Giacomo e Luigi Spedini & C.S.n.c.
    Inventor: Luigi Spedini