Patents by Inventor Yosiharu Yamamoto

Yosiharu Yamamoto 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 production of olefin polymers
    Patent number: 4701505
    Abstract: An olefin is polymerized by using a catalyst consisting essentially of (A) a solid catalyst component containing a magnesium halide and a titanium chloride, (B) an organic aluminum compound, and (C) an ether compound represented by the formula: R.sup.1 R.sup.2 R.sup.3 C(OR.sup.4), R.sup.1 R.sup.2 C(OR.sup.4).sub.2 or R.sup.1 C(OR.sup.4).sub.3. The catalyst has high catalytic activity and high stereoregularity as well as good activity endurance and is especially suitable for production of block copolymers.
    Type: Grant
    Filed: September 23, 1985
    Date of Patent: October 20, 1987
    Assignee: Mitsubishi Petrochemical Company Limited
    Inventors: Masaki Fujii, Takao Sakai, Hideo Sakurai, Yosiharu Yamamoto