Patents by Inventor Umewaka Nakatani

Umewaka Nakatani 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 producing modified molded polymer article
    Patent number: 5069943
    Abstract: Flame retardance of polymers prepared by metathesis polymerization of cycloolefins is improved by treatment of molded articles with a halogenated hydrocarbon capable of entering into radical chain transfer reactions with the carbon-carbon unsaturation present in the polymer recurring unit.
    Type: Grant
    Filed: December 18, 1989
    Date of Patent: December 3, 1991
    Assignee: Hercules Incorporated
    Inventors: Shigeyoshi Hara, Umewaka Nakatani
  • Process for producing modified molded polymer articles
    Patent number: 5061521
    Abstract: A method for improving the properties of a metathesis polymerized cycloolefin article by treating with molecular halogen in an organic solvent. Degree of treatment can be regulated according to the swelling power of the solvent for the polymer. Improved properties include improved flame retardance, oxidation resistance and surface properties.
    Type: Grant
    Filed: December 18, 1989
    Date of Patent: October 29, 1991
    Assignee: Hercules Incorporated
    Inventors: Zen-ichiro Endo, Shigeyoshi Hara, Umewaka Nakatani
  • Process for producing modified molded polymer article
    Patent number: 5045362
    Abstract: A metathesis polymerized cycloolefin article may be improved by treating with halogen halide in an organic solvent. Degree of treatment can be regulated according to the swelling power of the solvent for the polymer. Improved properties include improved flame retardance, oxidation resistance and surface properties.
    Type: Grant
    Filed: December 18, 1989
    Date of Patent: September 3, 1991
    Assignee: Hercules Incorporated
    Inventors: Shigeyoshi Hara, Umewaka Nakatani
  • Process for producing a colored molded article of metathesis polymerized polymer
    Patent number: 4918138
    Abstract: A process for producing a colored cross-linked molded article by metathesis polymerizing in a mold a mixture comprising metathesis polymerizable monomers such as dicyclopentadiene and a metathesis polymerizable multi-part composition therefor.
    Type: Grant
    Filed: February 15, 1989
    Date of Patent: April 17, 1990
    Assignee: Hercules Incorporated
    Inventors: Shigeyoshi Hara, Zen-ichiro Endo, Umewaka Nakatani