Patents by Inventor Alexander Blackhall

Alexander Blackhall 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).

  • Oxadiazole polymers
    Patent number: 4066601
    Abstract: The production of a brominated, polyarylene - 1, 3, 4- oxadiazole solution in oleum involves adding bromine to a precursor solution of the polymer, wherein the polymer is capable of further polymerization and the solution has a viscosity below a predetermined minimum value, and then further polymerizing the brominated polymer to an extent which effects an increase in the viscosity to at least the predetermined minimum value.
    Type: Grant
    Filed: November 24, 1975
    Date of Patent: January 3, 1978
    Assignee: Imperial Chemical Industries Limited
    Inventors: Alexander Blackhall, Donald Lithgow Brydon, John David Seddon