Patents by Inventor Shozaburo Hiratsuka

Shozaburo Hiratsuka 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).

  • Wholly aromatic polyamide fiber
    Patent number: 4670343
    Abstract: Surface frictional characteristics of a wholly aromatic polyamide fiber are desirably modified by applying to the fiber at least 0.05% by weight, based on the fiber, of a reaction product of a polyoxyethylene adduct of glyceride having at least one hydroxyl group in the molecule with a dibasic acid and/or a dibasic anhydride. Preferably, prior to the application of the reaction product, at least 0.01% by weight of an inorganic compound powder is applied to the fiber.
    Type: Grant
    Filed: April 19, 1985
    Date of Patent: June 2, 1987
    Assignee: Teijin Limited
    Inventors: Shoji Makino, Michikage Matsui, Shozaburo Hiratsuka
  • Process for producing wholly aromatic polyamide filaments heat-treated under tension
    Patent number: 4525384
    Abstract: In a process for producing heat-treated wholly aromatic polyamide filaments comprising at least one wholly aromatic polyamide having recurring units of the formula (I): ##STR1## and at least one type of recurring units selected from those of the formula (II): ##STR2## where Ar represents a divalent aromatic radical selected from those of the formulae (III) and (IV): ##STR3## and R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.
    Type: Grant
    Filed: March 6, 1984
    Date of Patent: June 25, 1985
    Assignee: Teijin Limited
    Inventors: Akihiro Aoki, Shozaburo Hiratsuka, Norihisa Yamaguchi, Shoji Makino