Patents by Inventor Ryoji Takamura

Ryoji Takamura 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).

  • Ultraviolet ray measuring apparatus for predicting sunburn level and for obtaining SPF values of cosmetics
    Patent number: 5148023
    Abstract: An ultraviolet ray measuring apparatus is provided which comprises first and second photodiodes having substantially the same spectral sensitivity at least in an ultraviolet band, and a first optical filter arranged in front of a light-receiving face of the second photodiode, for shielding only light of at least a part of the ultraviolet band. The apparatus measures the light intensity and its accumulated value in accordance with the difference between electric signals output from the first and second photodiodes. It is preferable that a second optical filter, which has a main transmitting band in the ultraviolet band and a sub-transmitting band in the visible light range, be arranged in front of the light-receiving faces of the first and second photodiode.
    Type: Grant
    Filed: April 9, 1990
    Date of Patent: September 15, 1992
    Assignee: Toray Industries, Inc.
    Inventors: Mutsumi Hayashi, Ryoji Takamura, Chikayasu Yamazaki, Minoru Ueda, Ichiro Kumo