Patents by Inventor Ronald E. Rothwell

Ronald E. Rothwell 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).

  • Production of polyester fibers of improved stability
    Patent number: 4374960
    Abstract: There is provided by this invention a process for the production of high molecular weight linear polyethylene terephthalate condensation polyesters which are useful especially for preparing specialty fibers which have excellent resistance to degradation so that they can be used in such commercial articles as paper making machine fabric, industrial belting, etc. The improved high molecular weight linear polyethylene terephthalate condensation polyester specialty fibers are characterized by improved hydrolytic stability and by reduction in the free carboxyl content so as to have a carboxyl concentration of less than about 6 gram equivalents per 10.sup.6 grams of the polyester.
    Type: Grant
    Filed: September 16, 1981
    Date of Patent: February 22, 1983
    Assignee: Allied Corporation
    Inventors: Ronald E. Rothwell, Hugh H. Rowan, James J. Dunbar