Patents by Inventor Okimasa Ohsawa

Okimasa Ohsawa 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 manufacturing a pulp molding die
    Patent number: 5745971
    Abstract: A method of manufacturing a pulp molding die, by providing a superplastic material plate having a plurality of preformed through-holes, closing the plurality of preformed through-holes, heating the superplastic material plate under a pressurized atmosphere, forming the plate into a desired shape, and uncovering the plurality of preformed through-holes of the plate, thereby forming the pulp molding die.
    Type: Grant
    Filed: April 8, 1996
    Date of Patent: May 5, 1998
    Assignees: Nippon Paper Industries Co., Ltd., Nippon Yakin Kogyo Co., Ltd.
    Inventors: Okimasa Ohsawa, Kuniaki Osada, Nobuyoshi Okato, Tatsuo Katagiri