Patents by Inventor Keichiro Saito

Keichiro Saito 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).

  • Heat-sealable crosslinked oriented polyethylene film and production thereof
    Patent number: 5185203
    Abstract: Disclosed are a heat-sealable crosslinked oriented polyethylene film having low-temperature heat sealabilitiy which enables high-speed bag making, improved in antiblocking property and excellent in clarity and moistureproofness, comprising a crosslinked, biaxially oriented high density polyethylene film in which the degree of crosslinking inwardly decreases across the thickness of the film, and a heat sealing layer placed thereon, the heat sealing layer being composed of a tackifier and an ethylene-vinyl acetate copolymer containing an antiblocking agent or composed of 1,2-polybutadiene containing an antiblocking agent, preferably further comprising a heat sealing layer free from an antiblocking agent placed between the biaxially oriented film and the heat sealing layer containing the antiblocking agent, and a process for the production of the same.
    Type: Grant
    Filed: November 14, 1989
    Date of Patent: February 9, 1993
    Assignee: Tonen Sekiyukagaku K.K.
    Inventors: Yasushi Itaba, Minoru Izawa, Keichiro Saito, Takayoshi Kondo
  • Differentially crosslinked and oriented polyethylene film
    Patent number: 4705714
    Abstract: An oriented film is prepared by crosslinking a sheet of HDPE to provide maximum crosslinking at the surfaces of the sheet and minimum orientation at its middle layer portion, and thereafter heating and stretching the film to obtain an oriented HDPE of high clarity film of improved moisture proof.
    Type: Grant
    Filed: March 6, 1986
    Date of Patent: November 10, 1987
    Assignee: Toa Nenryo Kogyo K.K.
    Inventors: Yasushi Itaba, Keichiro Saito, Jyoichi Tabuchi, Masao Yoshizawa
  • Polyethylene stretched film
    Patent number: 4673619
    Abstract: An oriented film is prepared by crosslinking a sheet of polyethylene (preferably HDPE) containing particulate inorganic slip and antiblock additions to provide maximum crosslinking at the surfaces of the sheet and minimum orientation at its middle layer portion, and thereafter heating and stretching the film to obtain an oriented HDPE of high clarity film of improved moisture proof.
    Type: Grant
    Filed: August 15, 1986
    Date of Patent: June 16, 1987
    Assignee: Toa Nenryo Kabushiki Kaisha
    Inventors: Yasushi Itaba, Tadao Yoshino, Yutaka Yoshifuji, Keichiro Saito, Jyoichi Tabuchi
  • Method of producing crosslinked polyethylene stretched film
    Patent number: 4636340
    Abstract: An oriented film is prepared by crosslinking a sheet of polyethylene (preferably HDPE) containing particulate inorganic slip and antiblock additions to provide maximum crosslinking at the surfaces of the sheet and minimum orientation at its middle layer portion, and thereafter heating and stretching the film to obtain an oriented HDPE of high clarity film of improved moisture proof.
    Type: Grant
    Filed: December 18, 1984
    Date of Patent: January 13, 1987
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Yasushi Itaba, Tadao Yoshino, Yutaka Yoshifuji, Keichiro Saito, Jyoichi Tabuchi
  • Method of producing oriented polyethylene film
    Patent number: 4590020
    Abstract: An oriented film is prepared by crosslinking a sheet of HDPE to provide maximum crosslinking at the surfaces of the sheet and minimum orientation at its middle layer portion, and thereafter heating and stretching the film to obtain an oriented HDPE of high clarity film of improved moisture proof.
    Type: Grant
    Filed: March 22, 1984
    Date of Patent: May 20, 1986
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Yasushi Itaba, Keichiro Saito, Jyoichi Tabuchi, Masao Yoshizawa