Patents by Inventor Herbert L. Fielding

Herbert L. Fielding 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).

  • Photopolymerizable compositions used in holograms
    Patent number: 4588664
    Abstract: Novel photopolymerizable compositions are provided which comprise a dye sensitizer, a branched polyethylenimine as a polymerization initiator and a free radical polymerizable ethylenic unsaturated monomer.In the preferred embodiments, the branched polyethylenimine is used in combination with lithium acrylate. This combination provides dry coatings which may be stored for extended periods prior to being activated for imaging, and which produce volume holograms of very high resolution and diffraction efficiency.
    Type: Grant
    Filed: August 20, 1984
    Date of Patent: May 13, 1986
    Assignee: Polaroid Corporation
    Inventors: Herbert L. Fielding, Richard T. Ingwall
  • Stabilization of holograms
    Patent number: 4535041
    Abstract: Volume phase holograms formed by photopolymerization of a polymerizable monomer, e.g., lithium acrylate, exhibit substantially increased retention of diffraction efficiency when exposed to high humidity if they are sequentially treated with a zirconium compound and a fatty acid.
    Type: Grant
    Filed: August 20, 1984
    Date of Patent: August 13, 1985
    Assignee: Polaroid Corporation
    Inventors: Herbert L. Fielding, Richard T. Ingwall