Patents by Inventor David J. Yamamoto

David J. Yamamoto 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).

  • Light projecting apparatus
    Patent number: 4017727
    Abstract: An elongated bar having a clamping head thereon is demountably attached to a photo flash unit to position a fresnel lens in the light beam path of the flash unit to project the light beam for telephoto use.
    Type: Grant
    Filed: November 12, 1975
    Date of Patent: April 12, 1977
    Inventor: David J. Yamamoto