Patents by Inventor Peter A. Bloxham

Peter A. Bloxham 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).

  • Method for controlling color formation during polytetramethylene ether glycol production
    Patent number: 5596074
    Abstract: A process for removing precursors, such as low boiling alkyl glycols (e.g., ethylene glycol and/or 1,2-propylene glycol), to undersirable color forming acetal impurities (e.g., 1,3 -dioxolane and 4-methyl-1,3-dioxolane) from technical grade 1,4-butanediol/2-methyl-1,4-butanediol mixtures and the like by distillative topping of the diol mixture prior to ring closing cyclization to corresponding tetrahydrofuran/3-methyl tetrahydrofuran mixture and subsequent polymerization to polytetramethylene glycol ether polymers. Such a process is useful to produce THF and PTMEG having a APHA color index of nearly zero.
    Type: Grant
    Filed: December 22, 1995
    Date of Patent: January 21, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Peter A. Bloxham, Anne I. Breikss, Richard E. Ernst, Leon S. Scott, John D. Super, James D. Verbsky