Patents by Inventor Naotoshi Sonoda

Naotoshi Sonoda 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).

  • Weatherability and adherence of polypropylene
    Patent number: 4997888
    Abstract: A process is provided for improving the resistance to deterioration when exposed to weather and the adherence to other materials of polypropylene, particularly in the form of moldings, which comprises subjecting a surface of polypropylene to the action of activated oxygen gas at a temperature below about 100.degree. C. in the presence of an N-alkyl or N-acyl 2,2,6,6-tetramethyl piperidyl compound for a time sufficient to improve such weather resistance and adherence.
    Type: Grant
    Filed: July 6, 1989
    Date of Patent: March 5, 1991
    Assignee: Adeka Argus Chemical Co., Ltd.
    Inventors: Tetsuo Sekiguchi, Yutaka Nakahara, Masaki Yagi, Naotoshi Sonoda
  • Weatherability and adherence of polypropylene
    Patent number: 4994529
    Abstract: A process is provided for improving the resistance to deterioration when exposed to weather and the adherence to other materials of polypropylene, particularly in the form of moldings, which comprises subjecting a surface of polypropylene to the action of activated oxygen gas at a temperature below about 100.degree. C. in the presence of an N-alkyl or N-acyl 2,2,6,6-tetramethyl piperidyl compound for a time sufficient to improve such weather resistance and adherence.
    Type: Grant
    Filed: December 6, 1989
    Date of Patent: February 19, 1991
    Assignee: Adeka Argus Chemical Co., Ltd.
    Inventors: Tetsuo Sekiguchi, Masaki Yagi, Yutaka Nakahara, Naotoshi Sonoda