Patents by Inventor Tadao Marui

Tadao Marui 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: 5299926
    Abstract: A novel spinning apparatus is provided with a tubular coagulating liquid flow control valve body made of an elastomeric material and whose inner diameter is changeable according to external pressure. The valve body has a simple structure and is easy to retrofit to a conventional spinning apparatus. When dope is extruded, a mass of dope with gelled skin can pass easily and quickly through the opened valve body so that the spinning workability at the start of spinning is high. Further, since the coagulating liquid flows smoothly, the spinning speed can be increased without damaging the filaments.
    Type: Grant
    Filed: October 23, 1992
    Date of Patent: April 5, 1994
    Assignee: Sumika-Hercules Co., Ltd.
    Inventors: Shigeru Nakajima, Tadao Marui