Patents by Inventor Syouetsu Sakamoto

Syouetsu Sakamoto 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).

  • High efficiency fluorescent lamp with low color rendering property
    Patent number: 6242857
    Abstract: A fluorescent lamp which produces primary light using a green emission phosphor with a peak emission wavelength at 530 nm to 560 nm and a red emission phosphor with a peak emission wavelength at 600 nm to 630 nm, is characterized in that, under illumination by said fluorescent lamp, four test colors for special color rendering index calculation, No. 9, No. 10, No. 11, and No. 12, specified in the Commission Internationale de l'Eclairage CIE Publication No. 13.3, are perceivable as red, yellow, green, and purplish blue, respectively, in terms of Munsell hues.
    Type: Grant
    Filed: November 10, 1998
    Date of Patent: June 5, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kenjiro Hashimoto, Tadashi Yano, Masanori Shimizu, Syouetsu Sakamoto
  • Light source
    Patent number: 6224240
    Abstract: A light source for categorical color perception has major light emitting bands in ranges from 530 to 580 [nm] and from 600 to 650 [nm], with correlated color temperature of the lamp light color in a range from 1700 to 6500 [K] and with DUV (distance from perfect radiator locus on UV coordinates) in a range from 0 to 70, and allows categorical perception of at least red, green, blue, yellow and white of surface colors of an illuminated object.
    Type: Grant
    Filed: August 4, 1997
    Date of Patent: May 1, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masanori Shimizu, Yasuhiko Yamanaka, Syouetsu Sakamoto, Tetsuji Takeuchi
  • Light source with only two major light emitting bands
    Patent number: 6153971
    Abstract: A light source for categorical color perception has major light emitting bands in ranges from 530 to 580 and from 600 to 650, with correlated color temperature of the lamp light color in a range from 1700 to 6500 and with DUV (distance from perfect radiator locus on UV coordinates) in a range from 0 to 70, and allows categorical perception of at least red, green, blue, yellow and white of surface colors of an illuminated object.
    Type: Grant
    Filed: June 10, 1999
    Date of Patent: November 28, 2000
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masanori Shimizu, Yasuhiko Yamanaka, Syouetsu Sakamoto, Tetsuji Takeuchi