Patents by Inventor Richard C. Bingham

Richard C. Bingham 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).

  • Organic pigments derived from coumarin
    Patent number: 4240967
    Abstract: This application is directed to compounds which are useful as pigments. The compounds are represented by the formula: ##STR1## where R.sub.1 is hydrogen, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, chlorine or bromine;R.sub.2 is hydrogen, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, chlorine, bromine and nitro; and ##STR2## where R.sub.4 and R.sub.5 are hydrogen, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, chlorine or bromine.
    Type: Grant
    Filed: August 13, 1979
    Date of Patent: December 23, 1980
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Richard C. Bingham
  • Organic pigments derived from benzocoumarin
    Patent number: 4177195
    Abstract: This application teaches that yellow to orange organic pigments may be produced by reacting a benzocoumarin with a selected aromatic diamine.
    Type: Grant
    Filed: April 20, 1978
    Date of Patent: December 4, 1979
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Richard C. Bingham