Patents by Inventor Stanislaw B. Ziemecki

Stanislaw B. 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).

  • Selective low pressure hydrogenation of a dinitrile to an aminonitrile
    Patent number: 5151543
    Abstract: Selective hydrogenation of aliphatic dinitriles to aminonitriles is achieved under low pressure with high yield preferably using a Raney nickel or Raney colbalt-containing catalyst.
    Type: Grant
    Filed: May 31, 1991
    Date of Patent: September 29, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Stanislaw B. Ziemecki
  • Pd/Re hydrogenation catalyst for making tetrahydrofuran and 1,4-butanediol
    Patent number: 4609636
    Abstract: Palladium/rhenium-on-carbon catalyst; a method employing said catalyst to produce tetrahydrofuran, 1,4-butanediol or mixtures thereof in selectable ratios from a number of starting reactants; and a method for making the Pd/Re/C catalyst.
    Type: Grant
    Filed: June 4, 1985
    Date of Patent: September 2, 1986
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Melinda A. Mabry, William W. Prichard, Stanislaw B. Ziemecki
  • Process for making tetrahydrofuran and 1,4-butanediol using Pd/Re hydrogenation catalyst
    Patent number: 4550185
    Abstract: Palladium/rhenium-on-carbon catalyst; a method employing said catalyst to produce tetrahydrofuran, 1,4-butanediol or mixtures thereof in selectable ratios from a number of starting reactants; and a method for making the Pd/Re/C catalyst.
    Type: Grant
    Filed: December 22, 1983
    Date of Patent: October 29, 1985
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Melinda A. Mabry, William W. Prichard, Stanislaw B. Ziemecki
  • Process for oxidation of methanol to formaldehyde with nitrous oxide
    Patent number: 4233248
    Abstract: Formaldehyde is synthesized by continuously passing a gaseous mixture of methanol and nitrous oxide over a metallic silver-containing catalyst bed at a temperature of about 475 to about 675.degree. C.
    Type: Grant
    Filed: February 21, 1979
    Date of Patent: November 11, 1980
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: V. N. Mallikarjuna Rao, Stanislaw B. Ziemecki