Patents by Inventor Robert DeWald Lipscomb

Robert DeWald Lipscomb 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).

  • Polyolefin/chromium modified mineral compositions and process for their preparation
    Patent number: 3950303
    Abstract: Described is a process for preparing polyolefin/inorganic filler compositions in whichA. an inorganic filler is contacted with a solution of a chromium(III) compound whereby the chromium compound is adsorbed onto the surface of the filler,B. the chromium-modified filler is activated by drying,C. the filler is dispersed as a slurry in an inert, liquid hydrocarbon,D. an organoaluminum compound is added to the slurry,E. olefin is polymerized in the slurry, andF. the resulting filler having olefin polymerized thereon is isolated as a free-flowing, essentially homogeneous powder.
    Type: Grant
    Filed: March 11, 1974
    Date of Patent: April 13, 1976
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Robert DeWald Lipscomb