Patents by Inventor Yutaka Tominaga

Yutaka Tominaga 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).

  • Patent number: 5272794
    Abstract: A flexible closure device comprises a pair of elongated fastener strips each including a web portion and a marginal portion. The marginal portion includes a plurality of interlocking ribs terminating in hooked coupling heads for coupling engagement with corresponding coupling heads. The middle rib has its hooked coupling heads project slightly beyond the rest of ribs. One side surface, of the middle rib, devoid of the hooked coupling head is slightly inclined downwardly outwardly relative to the general plane of the middle rib.
    Type: Grant
    Filed: April 12, 1993
    Date of Patent: December 28, 1993
    Assignee: Yoshida Kogyo K.K.
    Inventors: Tsutomu Hamatani, Yutaka Tominaga
  • Patent number: 5081747
    Abstract: A slide fastener slider comprises a pair of upper and lower wings joined integrally together at its front end by a diamond; and a pair of flanges disposed between the upper and lower wings and converged towards the rear end of the slider to thus define with the diamond a Y-shaped guide channel for running of fastener element rows therethrough. The slider further includes a plurality of large-diametered guide rollers rotatably mounted thereon for rolling engagement with the fastener element rows. The slider is specifically constructed such that there remain open spaces around the guide rollers, so that stringer tapes is quite immune from being stuck in the guide rollers.
    Type: Grant
    Filed: October 1, 1990
    Date of Patent: January 21, 1992
    Assignee: Yoshida Kogyo K.K.
    Inventors: Toshiaki Takizawa, Yutaka Tominaga
  • Patent number: 4217728
    Abstract: A flow rectifying device is provided in a cultivation basin used in the cultivation of algae of the type in which there is a horizontal circulating flow of the cultivation water. The flow rectifying device avoids the formation of puddles or stagnant water and provides for uniform flow of the circulating water as the direction of flow changes at corners of the basin. The flow rectifying means includes a plurality of curved parallel fins for smoothly deflecting the flow of the circulating cultivation water and thereby prevents contamination of the cultivation liquid by preventing algae from being destroyed. The apparatus is particularly useful in cultivating blue-green algae of the genus Spirulina and other aquatic lower algae.
    Type: Grant
    Filed: October 10, 1978
    Date of Patent: August 19, 1980
    Assignee: Dainippon Ink & Chemicals Inc.
    Inventors: Hidenori Shimamatsu, Yutaka Tominaga
  • Patent number: D325547
    Type: Grant
    Filed: October 19, 1990
    Date of Patent: April 21, 1992
    Assignee: Yoshida Kogyo K. K.
    Inventors: Kiyohiko Saito, Yutaka Tominaga
  • Patent number: D342466
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: December 21, 1993
    Assignee: Yoshida Kogyo K.K.
    Inventors: Yutaka Tominaga, Shinichi Daijougo