Patents by Inventor Rikuo Shoji

Rikuo Shoji 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).

  • Semipermeable membrane support
    Patent number: 4795559
    Abstract: Disclosed is a semipermeable membrane support and a process for making the same. The support is formed of a non-woven fabric of a laminated structure having a low density layer with an air permeability of 5 to 50 cc/cm.sup.2 /sec and a high density layer with an air permeability of 0.1 cc/cm.sup.2 to 5 cc/cm.sup.2 /sec, the non-woven fabric having an overall air permeability of 01 to 4.5 cc/cm.sup.2 /sec. The process for preparing such a support consists of laminating a dry processed web, which is entirely of polyester fibers containing 20 to 80% of undrawn polyester fiber or conjugate polyester fibers having an average fiber denier of 1 to 3 denier formed through a dry process, and an un-press-treated wet processed web, which is entirely of polyester fibers containing 30 to 90% of undrawn polyester fibers or conjugate polyester fibers having a fiber denier of 0.1 to 1.
    Type: Grant
    Filed: July 30, 1987
    Date of Patent: January 3, 1989
    Assignee: Firma Carl Freudenberg
    Inventors: Ietsugu Shinjou, Rikuo Shoji
  • Semipermeable membrane support and process for preparation thereof
    Patent number: 4728394
    Abstract: Disclosed is a semipermeable membrane support and a process for making the same. The support is formed of a non-woven fabric of a laminated structure having a low density layer with an air permeability of 5 to 50 cc/cm.sup.2 /sec and a high density layer with an air permeability of 0.1 cc/cm.sup.2 /sec to 5 cc/cm.sup.2 /sec, the non-woven fabric having an overall air permeability of 01 to 4.5 cc/cm.sup.2 /sec. The process for preparing such a support consists of laminating a dry processes web, which comprises entirely polyester fibers containing 20 to 80% of undrawn polyester fiber or conjugate polyester fibers having an average fiber denier of 1 to 3 denier formed through a dry process, and an un-press-treated wet processed web, which comprises entirely polyester fibers containing 30 to 90% of undrawn polyester fibers or conjugate polyester fibers having fiber denier of 0.1 to 1.
    Type: Grant
    Filed: March 19, 1986
    Date of Patent: March 1, 1988
    Assignee: Firma Carl Freudenberg
    Inventors: Ietsugu Shinjou, Rikuo Shoji
  • Preparation of non-woven fabric containing polyvinyl alcohol fiber
    Patent number: 4639390
    Abstract: The present invention is in a web and method for preparation of non-woven fabric which contains polyvinyl alcohol fiber comprising the steps offorming a web containing scarcely soluble polyvinyl alcohol fiber which is soluble or swellable in the presence of water at a temperature of 90.degree. C. or higher in the amount at least 10% by weight,providing water in said web, andpartially thermally bonding the web so that bonded area occupies 5 to 40% of the web area.
    Type: Grant
    Filed: November 1, 1985
    Date of Patent: January 27, 1987
    Assignee: Firma Carl Freudenberg
    Inventor: Rikuo Shoji