Patents Represented by Attorney H. A. Burgess

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  • Acrylic star polymers containing multi-functional monomers in the core, made by group transfer polymerization
    Patent number: 4794144
    Abstract: Large acrylic star polymers containing multifunctional monomers in the core are made by group transfer polymerization techniques, preferably by arm-first, core-first, or arm-core-arm approaches.
    Type: Grant
    Filed: September 30, 1986
    Date of Patent: December 27, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Harry J. Spinelli
  • Process for cleaning substrates
    Patent number: 4759774
    Abstract: Particulate polymethyl methacrylate polymerized in the presence of alumina trihydrate filler provides a superior blasting media for cleaning surfaces, such as for stripping paint from sensitive substrates like aluminum aircraft skin.
    Type: Grant
    Filed: October 23, 1986
    Date of Patent: July 26, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Jerome Hochberg, Robert B. Young
  • Enhanced livingness of polymerization using silylated oxyanions
    Patent number: 4736003
    Abstract: Silylated oxyanion catalysts, such as trimethyl silyl 3-chlorobenzoate, provide increased livingness of group transfer polymerization, thereby permitting higher molecular weights and polymerization efficiencies.
    Type: Grant
    Filed: February 27, 1987
    Date of Patent: April 5, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Luke V. Schneider, Ira B. Dicker
  • Acrylourethane reaction product
    Patent number: 4711929
    Abstract: The ungelled reaction product of an acrylic prepolymer, a diol and a diisocyanate, reacted in the presence of a small amount of a monoalcohol to prevent gelling, is an acrylourethane polymer which may be acid modified and is useful in high solids coating compositions.
    Type: Grant
    Filed: November 25, 1986
    Date of Patent: December 8, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Andrew P. Stamegna, Clifford H. Strolle
  • Plasticized poly(vinyl fluoride)
    Patent number: 4698382
    Abstract: Polyvinyl fluoride is plasticized with trimethyltrimellitate or related low molecular weight mellitates or phthalates without exudation.
    Type: Grant
    Filed: September 30, 1986
    Date of Patent: October 6, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: George R. McClure, Eustathios Vassiliou
  • Preparation of fluoropolymer coated material
    Patent number: 4698110
    Abstract: A process for coating polyvinyl fluoride layers on one or both sides of a textile material in the form of a coalesced gel which is subsequently cured by heating.
    Type: Grant
    Filed: November 27, 1985
    Date of Patent: October 6, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Eustathios Vassiliou
  • Group transfer processes for acrylic star polymers
    Patent number: 4695607
    Abstract: Large acrylic star polymers, are made by group transfer polymerization techniques by arm-first, core-first, or arm-core-arm approaches.
    Type: Grant
    Filed: September 3, 1985
    Date of Patent: September 22, 1987
    Assignee: E. I. Du Pont De Nemours and Company
    Inventor: Harry J. Spinelli
  • Non-stick silicone blend coating
    Patent number: 4684577
    Abstract: A blend of major amounts of a first silicon resin having relatively low proportions of silanol, phenyl and methyl groups with minor amounts of a second silicone resin having higher such proportions, preferably with aluminum flake, gives good adhesion to steel, aluminum and glass substrates and good non-stick performance for cooking foods. It can be used as a single-layer coating.
    Type: Grant
    Filed: September 30, 1986
    Date of Patent: August 4, 1987
    Assignee: E. I. Du Pont De Nemours and Company
    Inventor: Jean L. Coq
  • Thixotropic material coating apparatus, distributor device and method
    Patent number: 4684551
    Abstract: An apparatus, process and distributor for providing thin, uniform coating of thixotropic materials on substrates, especially on cylinders. The distributor equally subdivides the coating composition from entry ports to a plurality of exit ports.
    Type: Grant
    Filed: February 6, 1986
    Date of Patent: August 4, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Eustathios Vassiliou
  • Acrylic star polymers containing single-and multi-functional monomers in the core
    Patent number: 4659782
    Abstract: Large acrylic star polymers, having a low polydispersity of polymer molecular weight and of arm molecular weight and containing single- and multi-functional monomers in the core.
    Type: Grant
    Filed: September 3, 1985
    Date of Patent: April 21, 1987
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Harry J. Spinelli
  • Acrylic star polymers containing multifunctional monomers in the core
    Patent number: 4659783
    Abstract: Large acrylic star polymers, having a low polydispersity of polymer molecular weight and of arm molecular weight and containing multifunctional monomers in the core.
    Type: Grant
    Filed: September 3, 1985
    Date of Patent: April 21, 1987
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Harry J. Spinelli
  • Rheology control of polyvinyl fluoride dispersions
    Patent number: 4647481
    Abstract: The viscosity of thixotropic dispersions of polyvinyl flouride in latent solvents is controlled by adding volatile alcohols or acids to decrease viscosity, stirring the dispersion to eliminate gas bubbles, and then adding volatile amines to increase viscosity on curing the amine and the alcohol or acid evaporate together to keep viscosity in desirable ranges.
    Type: Grant
    Filed: February 20, 1986
    Date of Patent: March 3, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Eustathios Vassiliou
  • Polyvinyl fluoride coating process
    Patent number: 4645692
    Abstract: Substrates are coated by heating the substrates to temperatures of 120.degree.-260.degree. C. and dipping them into a bath of polyvinyl fluoride dispersed in latent solvent at temperatures below 100.degree. C.
    Type: Grant
    Filed: February 20, 1986
    Date of Patent: February 24, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Eustathios Vassiliou
  • Method of coating hollow massive objects with plastisols and organosol
    Patent number: 4636402
    Abstract: A process for curing a coating of plastisol or organosol on a hollow massive object by maintaining sufficient concentration of latent solvent in and near the coating to permit coalescence of the coating at temperatures above the boiling point of the latent solvent. Internal heating of the object is used.
    Type: Grant
    Filed: February 13, 1986
    Date of Patent: January 13, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Eustathios Vassiliou
  • Conductive primers
    Patent number: 4623481
    Abstract: An epoxyester linear block oligomer made with n-1 moles fatty acid units terminated with carboxylic acid groups and n moles of epoxy oligomer, when filled with carbon black, is a particularly effective electrically conductive primer for use over organic-based composites to be electrostatically painted.
    Type: Grant
    Filed: September 21, 1984
    Date of Patent: November 18, 1986
    Assignee: E. I. Du Pont de Nemours & Company
    Inventors: Jozef T. Huybrechts, August T. Timmerman
  • Coated microwave cookware
    Patent number: 4623565
    Abstract: An article of microwave cookware with a thermoset polyester substrate coated with an epoxy primer and a silicone resin topcoat which has two silicone resins with different methyl:phenyl ratios, one higher and the other lower to optimize both hardness and non-stick characteristics of the coating.
    Type: Grant
    Filed: May 30, 1985
    Date of Patent: November 18, 1986
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Jozef T. Huybrechts, Lawrence W. McKeen
  • Polymer life enhancement in oxyanion-catalyzed polymerization
    Patent number: 4622372
    Abstract: The duration of "livingness" in group transfer polymerization with oxyanion catalysts is enhanced by the presence of agents such as acetonitrile or silylated acetonitrile, resulting in higher molecular weight and/or lower polydispersity in the resulting polymers.
    Type: Grant
    Filed: February 20, 1986
    Date of Patent: November 11, 1986
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Ira B. Dicker, Clyde S. Hutchins, Harry J. Spinelli
  • Chip-resistant paint containing epoxyester linear block oligomer
    Patent number: 4602053
    Abstract: An epoxyester linear block oligomer made with n-1 moles fatty acid units terminated with carboxylic acid groups and n moles of epoxy oligomer is particularly suited for chip-resistant paints made with a low pigment volume concentration.
    Type: Grant
    Filed: May 24, 1984
    Date of Patent: July 22, 1986
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Jozef T. Huybrechts, Ferdinand F. Meeus, August T. Timmerman
  • Anodic electrodeposition of charged aqueous powder slurry
    Patent number: 4554061
    Abstract: A process for cathodic electrodeposition of small particle, below 20 .mu.m, resin powders coated with precipitated or adsorbed metal oxide or hydroxide at a pH above the isoelectric point giving a zeta potential of at least as negative as minus 35 millivolts. The preparation of the bath is also part of the invention.
    Type: Grant
    Filed: October 18, 1982
    Date of Patent: November 19, 1985
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Robert J. Ritchie
  • Coating composition of poly(arylene sulfide), polytetrafluoroethylene and barium or calcium sulfate
    Patent number: 4443574
    Abstract: Coating compositions of poly(arylene sulfide) and polytetrafluoroethylene have enhanced adhesion to substrates when they include barium or calcium sulfate, especially for coil coating use on cookware.
    Type: Grant
    Filed: November 19, 1982
    Date of Patent: April 17, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Jean-Louis G. Coq, Herman E. Seymus