Patents Assigned to E
  • Yttrium and rare earth compounds catalyzed lactone polymerization
    Patent number: 5095098
    Abstract: Process for yttrium and rare earth compound catalyzed polymerization of lactones and the living polymer compositions of such polymerizations, novel polyester products of such polymerizations and novel yttrium and rare earth metal compounds useful as catalysts in the polymerization of biodegradable polymers for medical uses and flexible films for packaging.
    Type: Grant
    Filed: April 3, 1991
    Date of Patent: March 10, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Stephan J. McLain, Neville E. Drysdale
  • Microporous elastic segmented polyurethane shaped structure
    Patent number: 5094914
    Abstract: Solutions of segmented polyurethanes are coagulated to form shaped structures comprising a substantially continuous pore-free sheath surrounding a cellular core.
    Type: Grant
    Filed: December 20, 1990
    Date of Patent: March 10, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Garret D. Figuly, Hsiang Shih, Linda H. Smith
  • Bimetallic coin blank, particularly for coins and the like
    Patent number: 5094922
    Abstract: A coin blank, particularly for minting of coins and the like, is formed by an external element of metal or metal alloy having a central aperture, on the edge surface of which are cut perimetrally a series of spaced grooves, and by an internal element, of metal or metal alloy different from the former, on the edge surface of which is formed a perimetral ridge, said external and internal elements being coupled inseparably during the minting operation through the plastic flow of the material from said perimetral ridge into said grooves in said external element and through the firm fitting of the material from said ridge into the portions of the edge surface of said central aperture in said external element, provided between adjacent grooves.
    Type: Grant
    Filed: August 27, 1990
    Date of Patent: March 10, 1992
    Assignees: Istituto Poligrafico E Zecca Dello Stato, Verres S.R.L. Societa per la Monetazione e Fonderia di Precisione
    Inventors: Nicola Ielpo, Piero Patarini
  • Oxidation resistant ceramic matrix composites
    Patent number: 5094901
    Abstract: Ceramic matrix composites having a boron containing oxygen-scavenging sealant-forming region coextensive with the internal fibers and interface debonding layer and a ceramic matrix material provide superior resistance to oxidation.
    Type: Grant
    Filed: July 19, 1990
    Date of Patent: March 10, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Paul E. Gray
  • Fluorescent compounds for absorption and re-emission of radiation
    Patent number: 5095099
    Abstract: This invention concerns novel fluorescent compositions having the potential for absorption of visible and UV radiation and for re-emitting the radiation at longer wavelengths. The compositions comprise rare earth chelates containing a phenalenone nucleus.
    Type: Grant
    Filed: December 10, 1990
    Date of Patent: March 10, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Bruce A. Parkinson, Andrew Streitwieser, Jr., Douglas W. Wiley
  • Method and apparatus for fabricating three dimensional objects from photoformed precursor sheets
    Patent number: 5094935
    Abstract: An imaging method and apparatus produces an integral three-dimensional object from a multiplicity of cross sectional portions of the object. The cross sectional portions correspond to photohardened portions of contiguous photoformed precursor sheets of a photohardenable liquid composition.
    Type: Grant
    Filed: June 26, 1990
    Date of Patent: March 10, 1992
    Assignee: E. I. DuPont de Nemours and Company
    Inventors: Eustathios Vassiliou, John A. Lawton
  • Passively actuated valve
    Patent number: 5094428
    Abstract: A valve comprises a valve body extending vertically, provided with an inlet conduit and an outlet conduit, at the interior of which there is located a suitable weighted shutter arranged for sliding in a guided manner between opening and closing positions for said conduits and to divide said valve body in an upper plenum chamber communicating with the sucking side of a pump and in a lower plenum chamber communicating with the delivery side of said pump.
    Type: Grant
    Filed: April 30, 1990
    Date of Patent: March 10, 1992
    Assignee: Comitato Nazionale Per la Ricerca E per lo Sviluppo Dell'Energia Nucleare E Delle Energie Alternative
    Inventors: Giovanni E. Farello, Antonio Naviglio
  • Method for preparing isoprenoid cyclopropane 1,1-dicarboxylates and derivatives thereof and novel intermediates
    Patent number: 5095136
    Abstract: A process is provided for preparing isoprenoid cyclopropane 1,1-dicarboxylates and derivatives thereof including the corresponding monocarboxylate, monocarboxylic acid and alcohol derivatives thereof, all of which are useful in preparing squalene synthetase inhibitors which inhibit cholesterol biosynthesis, and also useful in preparing pyrethrin insecticides.
    Type: Grant
    Filed: August 27, 1990
    Date of Patent: March 10, 1992
    Assignee: E. R. Squibb & Sons, Inc.
    Inventors: Scott A. Biller, Cornelia Forster
  • Supported perfluorinated ion-exchange polymers
    Patent number: 5094995
    Abstract: A catalyst composition comprising a perfluorinated ion-exchange polymer containing sulfonic acid groups supported on an inert carrier having a hydrophobic surface with a mean pore diameter of at least 1000 .ANG.. Use of this catalyst provides improved hydrocarbon conversion processes for oligomerization of olefins, hydration of olefins and hydrolysis of esters.
    Type: Grant
    Filed: August 2, 1989
    Date of Patent: March 10, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Martin H. D. Butt, Francis J. Waller
  • Oriented, shaped articles of pulpable para-aramid/meta-aramid blends
    Patent number: 5094913
    Abstract: Oriented, shaped articles such as films or fibers of para-aramid/meta-aramid blends which ar useful for the manufacture of para-aramid pulp, a process for making such articles and a pulp-making process are disclosed.
    Type: Grant
    Filed: March 8, 1990
    Date of Patent: March 10, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Hung H. Yang
  • Automatic system for adjusting the output impedance of fast CMOS drivers
    Patent number: 5095231
    Abstract: An automatic system for adjusting the output impedance of fast CMOS drivers, wherein the output impedance of a plurality of slaved drives is adjusted by a circuit for measuring and correcting mismatch between the output impedance of one of the drivers, taken as reference and dedicated for this purpose, and the impedance at the input of a reference transmission line, equal to the lines connected to the other drivers. The measuring of the output impedance of the reference drive is indirectly effected by inserting at the reference drive input a clock signal and by periodically measuring the output on the reference transmission line in correspondence with the positive half-period center.
    Type: Grant
    Filed: July 9, 1990
    Date of Patent: March 10, 1992
    Assignee: CSELT - Centro Studi e Laboratori Telecomunicazioni S.p.A.
    Inventors: Mario Sartori, Valter Bella, Franco Salerno
  • High performance aramid matrix composites
    Patent number: 5094794
    Abstract: Thermoprocessible aramid matrix polymer based composites have high flex and short beam shear strengths and low moisture uptake.
    Type: Grant
    Filed: May 1, 1991
    Date of Patent: March 10, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Robert B. Croman, Hamid M. Ghorashi, Gurdial Singh
  • Use of surfactants in phenol sulfonate dehydration
    Patent number: 5095132
    Abstract: A process for dehydrating phenol sulfonate salts by azeotropic distillation of water wherein a surfactant such as sodium dodecylbenzene sulfonate is used to prevent the salts from agglomerating and plating out on the walls of the reaction vessel.
    Type: Grant
    Filed: November 26, 1990
    Date of Patent: March 10, 1992
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Robert B. Pinkerton
  • Activation of noble metal catalysts using fluorohalocarbons or fluorohalohydrocarbons
    Patent number: 5094988
    Abstract: This invention provides a process for the regeneration and/or activation of a noble catalyst comprising contacting said catalyst with an atmosphere comprising a fluorohalocarbon and/or a fluorohydrocarbon of the formula, C.sub.n H.sub.m F.sub.p X.sub.q, wherein X is chlorine and/or bromine; n is an integer from 1 to 6; m is an integer from 0 to 6, provided that m can be no more than the total n in the compound; p and q are integers from 1-13 when the compound is acyclic and integers from 1-11 when the compound is cyclic, provided that the fluorohalocarbon and/or fluorohalohydrocarbon always contains at least one chlorine or bromine atom and provided that m+p+q=2n+2 when the compound is acyclic and that m+p+q=2n when the compound is cyclic, at a temperature in excess of 200.degree. C.
    Type: Grant
    Filed: September 20, 1990
    Date of Patent: March 10, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Carl S. Kellner, Jan J. Lerou, V. N. Mallikarjuna Rao, Klaus G. Wuttke
  • Preparation of methyl-1,3-5-triazines
    Patent number: 5095113
    Abstract: A method for making methyl-1,3,5-triazines including the 2,4-dichloro-6-methyl- and the 2-methyl-4-methylamino-6-methoxy-1,3,5-triazines, comprising reacting sodium dicyanamide with a cyclizing agent in the presence of HCl to make the 2,4-dichloro-6-methyl-triazine and reacting said triazine, additionally, with sodium methoxide and monomethylamine to make the 2-methyl-4-methylamino-6-methoxytriazine.
    Type: Grant
    Filed: April 26, 1991
    Date of Patent: March 10, 1992
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: George C. Chiang
  • Process for the preparation of glycosyl phosphate triesters
    Patent number: 5095123
    Abstract: Glycosyl phosphate triesters are prepared by reacting an anomeric mixture of a substituted hexopyranose with 4-N,N-dimethylaminopyridine and diphenyl chlorophosphate wherein using a specific order of addition determines the stereochemistry of the product.
    Type: Grant
    Filed: November 30, 1990
    Date of Patent: March 10, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Subramaniam Sabesan
  • Centrifuge particle size analyzer
    Patent number: 5095451
    Abstract: The invention provides a method and apparatus for determining particle size distribution of particulate samples. Particle size distribution is determined by measuring particle concentration (based on radiation transmittance measurement) as a function as time, and position along the direction in which the particles are settling. Preferably, the particles in a suspension are subjected to a centrifugal force field by rotation in a disc-shaped settling tank. A radiation source and detector scanning assembly, which is capable of radial movement with respect to the rotating settling tank, measures transmittance through the sample as a function of time and radial position. Also provided are mathematical relations suitable for determining particle size distribution from the measured data.
    Type: Grant
    Filed: July 13, 1989
    Date of Patent: March 10, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Terence Allen
  • Amide diol extended cathodic electrodeposition resins
    Patent number: 5095051
    Abstract: An improved electrodepositable cationic resin is disclosed. Prior art electrodepositable cationic resins are formed from polyepoxides which are chain extended with polyether or polyester polyols to internally flexibilize the resin. Our polyepoxide resin is chain extended with amide diol which gives a resin which is hydrolytically stable and does not tend to absorb moisture.
    Type: Grant
    Filed: August 6, 1990
    Date of Patent: March 10, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Ding Y. Chung, Tapan K. Debroy, Robert A. Tessmer
  • Process of making colored images using aqueous processable photosensitive elements
    Patent number: 5093221
    Abstract: A photosensitive element adapted for the preparation of colored images is disclosed. The photosensitive element comprises: a photosolubilizable layer consisting essentially of an acid-labile polymer and a photosolubilizing agent; an elastomeric layer; and a support. It can be processed by aqueous solvents, preferably ordinary tap water.
    Type: Grant
    Filed: August 5, 1991
    Date of Patent: March 3, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Gwendyline Y. Y. T. Chen, Floyd A. Raymond, Jeffrey J. Patricia, Walter R. Hertler
  • Coin sorter dispenser
    Patent number: D324600
    Type: Grant
    Filed: April 3, 1989
    Date of Patent: March 10, 1992
    Assignee: E&B Giftware, Inc.
    Inventor: So. K. Ho