Patents by Inventor Richard David Cramer

Richard David Cramer 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).

  • Preparation of high trans-isomer content 1,4-dienes
    Patent number: 4028429
    Abstract: 1,4-Dienes of high trans-isomer content are prepared by contacting ethylene with a 1,3-diene in the presence of a catalyst system comprising an organic solvent-soluble organonickel compound in which the nickel is zerovalent or divalent, a hydrocarbylaluminum chloride or bromide, and an aminophosphine. Optionally, the catalyst system may also contain a heteroorganoaluminum compound.
    Type: Grant
    Filed: January 9, 1976
    Date of Patent: June 7, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Richard David Cramer
  • Preparation of 1,4-dienes of high trans-isomer content
    Patent number: 4025570
    Abstract: 1,4-Dienes of high trans-isomer content are prepared by contacting ethylene with a 1,3-diene in the presence of a catalyst system comprising an organic solvent-soluble organonickel compound in which the nickel is zerovalent or divalent, a hydrocarbylaluminum chloride or bromide, and an aryl phosphinite. Optionally, the catalyst system may also contain a heteroorganoaluminum compound.
    Type: Grant
    Filed: January 9, 1976
    Date of Patent: May 24, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Richard David Cramer