Patents by Inventor Tomotsu Aruga

Tomotsu Aruga 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).

  • 5-[(4-N,N-ditolylamino)benzyl]-5H-dibenzo[a,d]-cycloheptane derivatives
    Patent number: 4996362
    Abstract: 5-[(4-N,N-ditolylamino)benzyl]-5H-dibenzo[a,d]-cycloheptane derivatives having formula (I), which are useful as organic photoconductive materials in electrophotography.
    Type: Grant
    Filed: May 3, 1990
    Date of Patent: February 26, 1991
    Assignee: Ricoh Company, Ltd.
    Inventors: Masaomi Sasaki, Tomotsu Aruga