Patents by Inventor Masuo Kubota

Masuo Kubota 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).

  • Latch mechanism for retractable writing instruments
    Patent number: 5074694
    Abstract: Mechanism for putting the head of a shaft into and out of the head of an outer sleeve comprised of an outer sleeve (1), a long hole (2) formed in the outer sleeve (1), and a clip (3) to be put into and out of the outer sleeve (1) through the long hole (2). A shaft (4) is inserted in the outer sleeve (1), and a cam mechanism (8) cooperates with the clip (3) in a manner that causes the cam mechanism (8) to move forward and backward in an axial direction according to in and out movement of the clip (3). A spring (6) spring-biases the shaft (4) toward the cam mechanism.
    Type: Grant
    Filed: October 31, 1990
    Date of Patent: December 24, 1991
    Assignee: Kotobuki & Co., Ltd.
    Inventors: Youichi Nakazato, Masuo Kubota, Shubei Kageyama, Yoshihide Mitsuya
  • Dual refill-type writing utensil
    Patent number: 5056947
    Abstract: In a writing utensil according to the present invention, when a rearward outer cylinder is rotated in either direction, a cam engaging projection, which is integral with the rearward outer cylinder, slides pressingly on either of the respective cam surfaces of first and second sliders. This causes one of the first and second sliders to advance, which in turn causes a first of the first and second refills to project forwardly while the other remains retracted. Similarly, when the rearward outer cylinder is rotated in the opposite direction, the cam engaging projection slides pressingly on the other of the cam surfaces of the first and second sliders. This causes advancement of the other of the sliders, and in turn causes the second of the first and second refills to be projected while the first remains retracted. The construction allows these operations to be smoothly, stably and positively performed.
    Type: Grant
    Filed: August 6, 1990
    Date of Patent: October 15, 1991
    Assignee: Kotobuki & Co., Ltd.
    Inventors: Masuo Kubota, Hidehei Kageyama, Saburo Kobayashi, Yoshihide Mitsuya, Tadayoshi Ebinuma
  • Clip actuated latch mechanism for retractable writing instruments
    Patent number: 4973179
    Abstract: Mechanism for putting the head of a shaft into and out of the head of an outer sleeve comprised of an outer sleeve (1), a long hole (2) formed in the outer sleeve (1), and a clip (3) to be put into and out of the outer sleeve (1) through the long hole (2). A shaft (4) is inserted in the outer sleeve (1), and a cam mechanism (8) cooperates with the clip (3) in a manner that causes the cam mechanism (8) to move forward and backward in an axial direction according to in and out movement of the clip (3). A spring (6) spring-biases the shaft (4) toward the cam mechanism.
    Type: Grant
    Filed: April 12, 1989
    Date of Patent: November 27, 1990
    Assignee: Kotobuki & Co., Ltd.
    Inventors: Youichi Nakazato, Masuo Kubota, Shuhei Kageyama, Yoshihide Mitsuya