Patents by Inventor Stanislaw Bogdan Ziemecki

Stanislaw Bogdan Ziemecki 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).

  • Aminonitrile production
    Patent number: 6258745
    Abstract: Provided is a selective hydrogenation process for producing aminonitriles by contacting the corresponding dinitriles with a hydrogen-containing fluid in the presence of a hydrogenation catalyst, a solvent and a cyanide compound.
    Type: Grant
    Filed: April 24, 2000
    Date of Patent: July 10, 2001
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Alex Sergey Ionkin, Stanislaw Bogdan Ziemecki, Theodore Augur Koch, Mark Jay Harper
  • Aminonitrile production
    Patent number: 6080884
    Abstract: A process for selectively hydrogenating a dinitrile to an aminonitrile is provided. The process comprises contacting a dinitrile with a hydrogen-containing fluid in the presence of a solvent and a metal catalyst in which the solvent comprises liquid ammonia, an alcohol, ammonium hydroxide, or combinations thereof and the metal catalyst comprises nickel and iron and can be supported on an inorganic support such as, for example, magnesium oxide.
    Type: Grant
    Filed: March 15, 1999
    Date of Patent: June 27, 2000
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Stanislaw Bogdan Ziemecki, Alex Sergey Ionkin
  • Aminonitrile production
    Patent number: 5986127
    Abstract: A process for selectively hydrogenating a dinitrile to an aminonitrile is provided. The process comprises contacting a dinitrile with a hydrogen-containing fluid in the presence of a solvent comprising an alcohol or liquid ammonia, at least one metal catalyst, and a carbonyl group-containing additive such as, for example, organic amides, organic esters, salts of carboxylic acids or urea.
    Type: Grant
    Filed: March 15, 1999
    Date of Patent: November 16, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Alex Sergey Ionkin, Stanislaw Bogdan Ziemecki, Mark Jay Harper, Theodore Augur Koch