Patents by Inventor Nicholas Nazarenko

Nicholas Nazarenko has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Flexible screen-printable conductive composition
    Patent number: 4425263
    Abstract: A screen-printable thick film conductor composition for membrane switches consisting of an active phase of conductive metal powder dispersed in an organic medium consisting essentially of a linear aromatic polyester resin dissolved in volatile solvent.
    Type: Grant
    Filed: November 2, 1981
    Date of Patent: January 10, 1984
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Nicholas Nazarenko
  • Process for the preparation of triarylboranes
    Patent number: 4376869
    Abstract: Agglomeration of dispersions of an alkali metal in an organic liquid is reduced by adding at least about 2.5% of an aryl halide, e.g., chlorobenzene.
    Type: Grant
    Filed: September 24, 1981
    Date of Patent: March 15, 1983
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Robert F. McCartney, Nicholas Nazarenko
  • Flexible screen-printable conductor composition
    Patent number: 4371459
    Abstract: Screen-printable conductor composition comprising (a) a conductive phase containing silver and base metal powders dispersed in a solution of (b) a multipolymer prepared by copolymerization of vinyl acetate, vinyl chloride, and an ethylenically unsaturated dicarboxylic acid and a linear aromatic polyester resin dissolved in (c) volatile nonhydrocarbon solvent.
    Type: Grant
    Filed: December 17, 1981
    Date of Patent: February 1, 1983
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Nicholas Nazarenko
  • Stabilization of sodium dispersion
    Patent number: 4348300
    Abstract: Agglomeration of dispersions of an alkali metal in an organic liquid is reduced by adding at least about 2.5% of an aryl halide, e.g., chlorobenzene.
    Type: Grant
    Filed: July 28, 1980
    Date of Patent: September 7, 1982
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Robert F. McCartney, Nicholas Nazarenko
  • Recovery of triarylboranes
    Patent number: 4251468
    Abstract: Triphenylborane is recovered from solutions of its alkali metal adduct by neutralization with carbon dioxide.
    Type: Grant
    Filed: December 21, 1979
    Date of Patent: February 17, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Nicholas Nazarenko
  • Process for the preparation of triarylborane
    Patent number: 4076756
    Abstract: Preparation of triarylboranes, e.g. triphenylborane by reacting an alkali metal, e.g. sodium; an organohalide, e.g. chlorobenzene and an orthoborate ester, e.g. triisopropylorthoborate in an inert organic solvent, recovering the borane by contacting the reaction product with water, removing alcohol from the aqueous mixture and contacting the resultant material with acid to a pH not less than about 6 to form the borane.
    Type: Grant
    Filed: November 12, 1975
    Date of Patent: February 28, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Nicholas Nazarenko, William Carl Seidel
  • Process for the preparation of triarylborane
    Patent number: 4046815
    Abstract: Preparation of triarylboranes, e.g. triphenylborane by reacting an alkali metal, e.g. sodium; an organohalide, e.g. chlorobenzene and an orthoborate ester, e.g. triisopropylorthoborate in an inert organic solvent, recovering the borane by contacting the reaction product with water, distilling volatiles from the aqueous mixture and contacting the resultant material with acid to a pH not less than about 6 to form the borane.
    Type: Grant
    Filed: May 17, 1976
    Date of Patent: September 6, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Nicholas Nazarenko
  • Process for the preparation of triarylboranes
    Patent number: 4045495
    Abstract: Preparation of triarylboranes, e.g. triphenylborane by reacting an alkali metal, e.g. sodium; an organohalide, e.g. chlorobenzene and an orthoborate ester, e.g. triisopropylorthoborate in an inert organic solvent, recovering the borane by contacting the reaction product with water while maintaining the ratio of borane to hydrolysis products (e.g. borinic acid) at at least 13/1, distilling volatiles from the aqueous mixture and contacting the resultant material with acid to a pH not less than about 6 to form the borane.
    Type: Grant
    Filed: November 12, 1975
    Date of Patent: August 30, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Nicholas Nazarenko, William Carl Seidel