Patents by Inventor Katsumi Akaike

Katsumi Akaike 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).

  • Polyamide production method
    Patent number: 9284410
    Abstract: A method of producing a polyamide includes (i) polycondensating a polyamide precursor containing a salt made from a dicarboxylic acid and a diamine under pressure in a pre-polymerization tank to obtain a prepolymer, and (ii) highly polymerizing the prepolymer with an extruder, wherein when the prepolymer in a molten state which is obtained in the step (i) is fed, by a pump, to the low-pressure extruder from the pre-polymerization tank through a discharge side pipe disposed downstream of the pump, the prepolymer is fed such that the length L [cm] of the discharge side pipe and the linear velocity of discharge v [cm/s] of the prepolymer by the pump satisfy the relationship expressed by the equation, 0.1 [s]?L/v<10 [s].
    Type: Grant
    Filed: June 19, 2012
    Date of Patent: March 15, 2016
    Assignee: Toray Industries, Inc.
    Inventors: Taku Ishimaru, Katsumi Akaike, Daisuke Kikuno, Tomoyuki Aoki, Minoru Noda, Yasunori Tsuda
  • POLYAMIDE PRODUCTION METHOD
    Publication number: 20150158977
    Abstract: A method of producing a polyamide includes (i) polycondensating a polyamide precursor containing a salt made from a dicarboxylic acid and a diamine under pressure in a pre-polymerization tank to obtain a prepolymer, and (ii) highly polymerizing the prepolymer with an extruder, wherein when the prepolymer in a molten state which is obtained in the step (i) is fed, by a pump, to the low-pressure extruder from the pre-polymerization tank through a discharge side pipe disposed downstream of the pump, the prepolymer is fed such that the length L [cm] of the discharge side pipe and the linear velocity of discharge v [cm/s] of the prepolymer by the pump satisfy the relationship expressed by the equation, 0.1 [s]?L/v<10 [s].
    Type: Application
    Filed: June 19, 2012
    Publication date: June 11, 2015
    Applicant: TORAY INDUSTRIES, INC.
    Inventors: Taku Ishimaru, Katsumi Akaike, Daisuke Kikuno, Tomoyuki Aoki, Minoru Noda, Yasunori Tsuda