Patents by Inventor Keizo Oosaki

Keizo Oosaki 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).

  • Method of regeneration of plastics material by removing outer deteriorated layer
    Patent number: 4208015
    Abstract: Method of regeneration of plastics material with higher quality from scrapped plastics, in which scrapped plastics having deteriorated surface layer caused by, such as, exposure to ultraviolet rays etc. are chopped, broken or crushed into fragmented product and this product is subjected to agitation in the presence of aqueous medium and solid particles exhibiting higher hardness than the product to scrape off the deteriorated surface layer of the scrapped plastics, whereupon the plastics material is recovered.
    Type: Grant
    Filed: October 6, 1978
    Date of Patent: June 17, 1980
    Assignee: Kabushiki Kaisha Meiji Gomu Kasei
    Inventors: Masanao Fujita, Toshiaki Sugawara, Keizo Oosaki