Patents by Inventor Tadashi Kikukawa

Tadashi Kikukawa 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).

  • Preparation process for esters and resist materials
    Patent number: 6248920
    Abstract: Process for the quantitative preparation of esters, with a high yield, which comprises reacting an aldehyde or ketone compound and an acid halide compound in a one pot reaction in the presence of at least one compound represented by the following formulae: RMgX   (I); RMgX/CuX   (II); and RLi or R(CuLi)½  (III); in which R represents a hydrocarbon group, and X represents a halogen atom. Production processes of a resist material and a semiconductor device are also disclosed.
    Type: Grant
    Filed: December 22, 1997
    Date of Patent: June 19, 2001
    Assignee: Fujitsu Limited
    Inventors: Satoshi Takechi, Tadashi Kikukawa
  • Process for the production of 2-fluoroisobutyric acid or its ester
    Patent number: 5527954
    Abstract: Provided is a process for the production of 2-fluoroisobutyric acid or its ester, which comprises reacting 2-hydroxyisobutyric acid or its ester with thionyl chloride and a hydrogen fluoride source.
    Type: Grant
    Filed: January 26, 1995
    Date of Patent: June 18, 1996
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Ryoichi Adachi, Masahiro Nishii, Tadashi Kikukawa, Yasuhito Kotsuji