Patents by Inventor Dennis Arthur Barr

Dennis Arthur Barr 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).

  • Aromatic polymers
    Patent number: 4051109
    Abstract: Aromatic polymers containing benzenoid groups and oxygen atoms in the polymer chains are made by the action of an alkali metal hydroxide on a dihalogeno-benzenoid compound in which each halogen atom is activated by an inert electron-attracting group such as --SO.sub.2 --.
    Type: Grant
    Filed: February 26, 1973
    Date of Patent: September 27, 1977
    Assignee: Imperial Chemical Industries Limited
    Inventors: Dennis Arthur Barr, John Brewster Rose