Patents by Inventor Sanjiro Murakami

Sanjiro Murakami 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).

  • Variable characteristic light filter
    Patent number: 3936147
    Abstract: A variable color light filter system comprises a variable light filter including a pair of superimposed different color chromatic polarizing components with axes at a right angle to each other and an achromatic polarizing filter component which is rotatable relative to the chromatic polarizing components. A quarter wave length retardation plate is positioned in front of the variable light filter and has its optical axis at 45.degree. to the vertical. In another form the achromatic polarizing filter component is positioned between two pairs of superimposed chromatic polarizing components all of which are of different colors.
    Type: Grant
    Filed: October 15, 1973
    Date of Patent: February 3, 1976
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventor: Sanjiro Murakami