Patents by Inventor Maurice James McDowell

Maurice James McDowell 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).

  • Patent number: RE29255
    Abstract: Acrylic polymer layers and colloidal silver halide photographic emulsions are coated to form layers without repellent spots from solutions containing a perfluoro compound .[.containing an intralinear carbonyl or sulfonyl group selected from the group: (1) perfluorocarbon compounds derived from perfluorocarboxylic acids having the general structure ##STR1## where C.sub.f is a fully fluorinated (perfluoro) saturated chain consisting of five or more carbon atoms which may or may not be an oxygen-interrupted carbon chain; X=OY or an amino group, where Y is H, alkali metal or an ammonium group, and (2) perfluoro compounds.]. derived from perfluorosulfonic and perfluorosulfuric acids having the general structure(C.sub.f).[..sub.x .]. (C.sub.H).sub.y (X)(Z)where C.sub.f is a fully fluorinated .Iadd.(perfluoro) saturated .Iaddend.carbon chain .[.as defined in paragraph (1).]. .Iadd.having six or more carbon atoms which may or may not be an oxygen-interrupted carbon chain.Iaddend.; C.sub.
    Type: Grant
    Filed: May 25, 1973
    Date of Patent: June 7, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Maurice James McDowell