Patents by Inventor Kazumi HAMAKAWA

Kazumi HAMAKAWA 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).

  • Recording material and recording sheet
    Patent number: 11370240
    Abstract: A recording material and a recording sheet having better color-developing performance, storage stability, etc. A recording material which contains (A) at least one color former, (B) at least one compound selected from the group including compounds represented by the following formula (I), and (C) at least one compound selected from the group including compounds represented by the following formula (II) (wherein R1 to R3 each represent a halogen atom, a nitro group, a C1 to C6 alkyl group, a C1 to C6 alkoxy group, a C2 to C6 alkenyl group or a C1 to C6 haloalkyl group, n1 and n3 each independently represent any integer of 0 to 5, n2 represents any integer of 0 to 4, and X represents —SO2—O— or —O—SO2—).
    Type: Grant
    Filed: January 24, 2018
    Date of Patent: June 28, 2022
    Assignee: NIPPON SODA CO., LTD.
    Inventors: Shuntaro Kinoshita, Kayoko Tada, Hiroshi Sakai, Kazumi Hamakawa
  • Recording material, and recording sheet
    Patent number: 11142015
    Abstract: A recording material and a recording sheet having excellent color-developing performance and storage stability and particularly having excellent heat-resistance of background. The recording material contains a color former (A), a compound represented by formula (I) (B), and a compound represented by formula (II) (C).
    Type: Grant
    Filed: August 21, 2017
    Date of Patent: October 12, 2021
    Assignee: NIPPON SODA CO., LTD.
    Inventors: Shuntaro Kinoshita, Kayoko Nomura, Kazumi Hamakawa, Hiroshi Sakai
  • RECORDING MATERIAL AND RECORDING SHEET
    Publication number: 20200180335
    Abstract: A recording material and a recording sheet having excellent color-developing performance and storage stability and particularly having excellent heat-resistance of background. The recording material contains a color former (A), a compound represented by formula (I) (B), and a compound represented by formula (II) (C).
    Type: Application
    Filed: August 21, 2017
    Publication date: June 11, 2020
    Applicant: NIPPON SODA CO., LTD.
    Inventors: Shuntaro KINOSHITA, Kayoko NOMURA, Kazumi HAMAKAWA, Hiroshi SAKAI
  • RECORDING MATERIAL AND RECORDING SHEET
    Publication number: 20190381820
    Abstract: A recording material and a recording sheet having better color-developing performance, storage stability, etc. A recording material which contains (A) at least one color former, (B) at least one compound selected from the group including compounds represented by the following formula (I), and (C) at least one compound selected from the group including compounds represented by the following formula (II) (wherein R1 to R3 each represent a halogen atom, a nitro group, a C1 to C6 alkyl group, a C1 to C6 alkoxy group, a C2 to C6 alkenyl group or a C1 to C6 haloalkyl group, n1 and n3 each independently represent any integer of 0 to 5, n2 represents any integer of 0 to 4, and X represents —SO2—O— or —O—SO2—).
    Type: Application
    Filed: January 24, 2018
    Publication date: December 19, 2019
    Applicant: NIPPON SODA CO., LTD.
    Inventors: Shuntaro KINOSHITA, Kayoko TADA, Hiroshi SAKAI, Kazumi HAMAKAWA
  • Recording material and recording sheet
    Patent number: 10226957
    Abstract: An object of the invention is to provide a recording material and recording sheet having excellent color-developing performance, storage stability, etc. A recording material having good color-developing performance and storage stability may be obtained by using a specific compound having a benzhydrol skeleton as an additive in a recording material employing color development through a reaction between a color former and a color-developing agent.
    Type: Grant
    Filed: January 27, 2016
    Date of Patent: March 12, 2019
    Assignee: NIPPON SODA CO., LTD.
    Inventors: Shuntaro Kinoshita, Kazumi Hamakawa, Hiroshi Sakai, Kayoko Tada
  • RECORDING MATERIAL AND RECORDING SHEET
    Publication number: 20180022137
    Abstract: An object of the invention is to provide a recording material and recording sheet having excellent color-developing performance, storage stability, etc. A recording material having good color-developing performance and storage stability may be obtained by using a specific compound having a benzhydrol skeleton as an additive in a recording material employing color development through a reaction between a color former and a color-developing agent.
    Type: Application
    Filed: January 27, 2016
    Publication date: January 25, 2018
    Applicant: NIPPON SODA CO., LTD.
    Inventors: Shuntaro KINOSHITA, Kazumi HAMAKAWA, Hiroshi SAKAI, Kayoko TADA