Patents by Inventor Youko Kuramitsu

Youko Kuramitsu 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).

  • Method of and apparatus for forming volume type phase hologram
    Patent number: 5231440
    Abstract: A method of and apparatus for forming a volume type phase hologram comprising the steps of, after exposure of a holographic material comprising a polymeric matrix having a radiation active substance associated therewith to an interference pattern of radiation, dipping the pattern-wise exposed holographic material in a swelling solution consisting of a first solvent which can act as a good solvent for the polymer of the matrix and a second solvent which can act as a poor solvent for the polymer and has a higher boiling point than that of the first solvent, and then pulling the swollen holographic material up from the swelling solution, whereby uniformly developed holograms having a large size and high qualities can be easily produced by a simple production process.
    Type: Grant
    Filed: June 30, 1992
    Date of Patent: July 27, 1993
    Assignee: Fujitsu Limited
    Inventors: Yasuo Yamagishi, Takeshi Ishitsuka, Motoaki Tani, Youko Kuramitsu
  • Method of and apparatus for forming volume type phase hologram
    Patent number: 5154994
    Abstract: A method of and apparatus for forming a volume type phase hologram comprising the steps of, after exposure of a holographic material comprising a polymeric matrix having a radiation active substance associated therewith to an interference pattern of radiation, dipping the pattern-wise exposed holographic material in a swelling solution consisting of a first solvent which can act as a good solvent for the polymer of the matrix and a second solvent which can act as a poor solvent for the polymer and has a higher boiling point than that of the first solvent, and then pulling the swollen holographic material up from the swelling solution, whereby uniformly developed holograms having a large size and high qualities can be easily produced by a simple production process.
    Type: Grant
    Filed: October 4, 1989
    Date of Patent: October 13, 1992
    Assignee: Fujitsu Limited
    Inventors: Yasuo Yamagishi, Takeshi Ishitsuka, Motoaki Tani, Youko Kuramitsu