Patents by Inventor Kazunari Okada

Kazunari Okada 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).

  • Process for preparing acetylene derivative from a ketone compound
    Patent number: 6127583
    Abstract: A preparation process of an acetylene derivative comprising reacting a compound having a skeleton represented by the formula (1): ##STR1## in the molecular formula with a compound represented by the formula (2): ##STR2## wherein R.sup.1, R.sup.2 R.sup.3 and R.sup.4 are individually an alkyl group having 1 to 6 carbon atoms and can be the same or different, R.sup.1 and R.sup.3 can bond each other to form a ring, and R.sup.1 and R.sup.2 or R.sup.3 and R.sup.4 can be bond each other to form one or two heterocyclic rings: or with a compound represented by the formula (3): wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are the same as in the formula (2), and X.sub.1 is a ##STR3## chlorine, bromine or iodine atom.
    Type: Grant
    Filed: March 31, 1999
    Date of Patent: October 3, 2000
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Hiroshi Sonoda, Kazunari Okada, Kenichi Goto, Kouki Fukumura, Junko Naruse, Hidetoshi Hayashi, Teruyuki Nagata, Akira Takahashi
  • Method for preparing biaxially stretched polyether ether ketone film
    Patent number: 5242648
    Abstract: A method for preparing a biaxially stretched polyether ether ketone (PEEK) film having excellent precision in thickness, insulating properties and heat shrinkage from an amorphous PEEK film which includes a first stretching step of roll-stretching the amorphous PEEK film in a temperature range of from 50.degree. C. to (Tg-10).degree. C. in a stretching ratio of from 150% to 350% in the progress direction of the film while a necking phenomenon is caused in the film; a second stretching step of stretching the film in the temperature range of from Tg to 170.degree. C. in a direction at right angles to the stretching direction in the first stretching step in a stretching ratio of from 150% to 350%; and a heat set step of thermally setting the stretched film at two stages in the temperature range of 210.degree.-330.degree. C. and the temperature range of 180.degree.-210.degree. C.
    Type: Grant
    Filed: April 1, 1992
    Date of Patent: September 7, 1993
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Shuji Matsumura, Kazunari Okada, Yasuhiko Ohta, Masumi Saruwatari