Patents by Inventor Akihiro Okuma

Akihiro Okuma 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 for developing electrostatic image using magnetic brush and one component magnetic toner
    Patent number: 4689285
    Abstract: An electrophotographic developing method for developing an electrostatic image formed on an electrostatic image supporting member by using a mono-component insulative developer is disclosed. Electrical potential of said developer for developing the electrostatic image is produced by frictional charging effect of said developer.
    Type: Grant
    Filed: September 4, 1985
    Date of Patent: August 25, 1987
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yasuhito Yuasa, Kazumasa Hayashi, Koreaki Nakata, Akihiro Okuma