Patents by Inventor Shin Ashizuka

Shin Ashizuka 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).

  • Process for treating development waste liquor
    Patent number: 6379558
    Abstract: An apparatus performs a process for treating development waste liquor containing photosensitive resin and surface active agent. The process subjects the waste liquor to treatment for diminishing the efficacy of the surface active agent to result in separation of the resin from the waste liquor. The waste liquor is then irradiated with ultraviolet light at 300-400 nm. The apparatus contains a tank, a stirrer, an ultraviolet source and a filter.
    Type: Grant
    Filed: October 6, 2000
    Date of Patent: April 30, 2002
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Nobuo Ogawa, Tsutomu Kojima, Shin Ashizuka, Andre Dheur
  • Process for treating development waste liquor
    Patent number: 6153107
    Abstract: A process for treating a development waste liquor containing a photosensitive resin and a surface active agent, which includes subjecting the waste liquor to a treatment for diminishing the efficacy of the surface active agent, thereby separating the resin component from the development waste liquor, thereafter irradiating the development waste liquor with an ultraviolet ray having a wavelength of 300 to 400 nanometers to cure the resin component in the development waste liquor, and then removing the resulting solids.
    Type: Grant
    Filed: August 11, 1998
    Date of Patent: November 28, 2000
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Nobuo Ogawa, Tsutomu Kojima, Shin Ashizuka, Andre Dheur