Patents by Inventor Geoffrey Joseph Ashwell

Geoffrey Joseph Ashwell 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).

  • Z-type films for second harmonic generation
    Patent number: 5786089
    Abstract: Optically non-linear materials suitable upon repeated Langmuir-Blodgett dipping for forming Z-type (head-to-tail) films for second harmonic generation include hemicyanine dyes which are very unsymmetrical, i.e. which have hydrophobic substituents differing in size by at least 4 carbon atoms, each end of a hydrophilic chromophore. A suitable dye is E-N-octadecyl-4-?2-(4-dibutylaminophenyl)ethenyl!quinolinium iodide.
    Type: Grant
    Filed: January 29, 1996
    Date of Patent: July 28, 1998
    Assignee: British Technology Group Ltd.
    Inventor: Geoffrey Joseph Ashwell