Patents by Inventor Akihiro Sasaki

Akihiro Sasaki 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).

  • Resin for plastic lens
    Patent number: 5449731
    Abstract: A transparent resin obtained by polymerizing styrene, a methacrylic or acrylic acid ester, a polyfunctional monomer, and if necessary a copolymerizable vinyl monomer in the presence of a molecular weight modifier is suitable for producing a polymer lens having a low specific gravity, and excellent in transparency, edging ability with other good properties.
    Type: Grant
    Filed: September 30, 1993
    Date of Patent: September 12, 1995
    Assignee: Hitachi Chemical Company, Ltd.
    Inventors: Minoru Suzuki, Akihiro Sasaki, Hiromasa Kawai, Fumiaki Kanega
  • 1,3-bis(dicarboxyphenyl)-1,1,3,3-tetraphenyldisiloxane derivative, process for producing the same, and process for producing polyimide from the same
    Patent number: 5055593
    Abstract: 1,3-Bis(dicarboxyphenyl)-1,1,3,3-tetraphenyldisiloxane derivatives useful as raw materials of polyimide resins, hardeners for epoxy resins and others and process for producing these derivatives, and polyamic acid and polyamic acid ester, and polyimide resins and processes for producing them from said disiloxane derivatives. The polyimide resins are good in properties such as adhesion to silicon substrates, heat resistance and mechanical properties.
    Type: Grant
    Filed: October 30, 1989
    Date of Patent: October 8, 1991
    Assignee: Hitachi Chemical Company, Ltd.
    Inventors: Akihiro Sasaki, Tohru Kikuchi