Patents by Inventor Yoiti Minematu

Yoiti Minematu 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 fluorescent lamp for accelerated exposure test on polymer
    Patent number: 4859903
    Abstract: An ultraviolet fluorescent lamp for accelerated artificial test on polymer is disclosed, which comprises a bulb consisting of an ultraviolet-ray-transmitting glass with the absorbance thereof having a wavelength of 280 nm being 1 to 3 with respect to ultraviolet rays, the inner surface of the bulb being provided with a phosphor having a characteristic that causes radiant energy transmitted through the bulb to increase by 5 to 17 times for every wavelength increase of 5 nm in a wavelength range of 295 to 310 nm, and that it has a radiant energy peak in a wavelength of 305 to 325 nm.
    Type: Grant
    Filed: March 2, 1988
    Date of Patent: August 22, 1989
    Assignees: Yoiti Minematu, Sankyo Denki Co., Ltd., Nichia Kagaku Kogyo K. K.
    Inventors: Yoiti Minematu, Toshio Tajima, Shigeharu Nakajima