Patents by Inventor Keichiro Saitoh

Keichiro Saitoh 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).

  • Oriented polyethylene film
    Patent number: 5145728
    Abstract: An oriented polyethylene film with an excellent moistureproofness and optical property is provided in which the degree of crosslinking is uniform or decreases inwardly across the thickness of the film, and which consists of a composition comprising (A) 50 to 90% by weight of polyethylene with a density of at least 0.935 g/cm.sup.3 and a high load melt index to melt index ratio of at most 100 and (B) 50 to 10% by weight of a petroleum resin or linear low density polyethylene.
    Type: Grant
    Filed: June 12, 1991
    Date of Patent: September 8, 1992
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Yasushi Itaba, Yutaka Yoshifuji, Takayoshi Kondo, Keichiro Saitoh, Tadao Yoshino, Minoru Izawa, Ichiro Sakamoto
  • Oriented polyethylene film
    Patent number: 5043204
    Abstract: An oriented polyethylene film with an excellent moistureproofness and optical property is provided in which the degree of crosslinking is uniform or decreases inwardly across the thickness of the film, and which consists of a composition comprising (A) 50 to 90% by weight of polyethylene with a density of at least 0.935 g/cm.sup.3 and a high load melt index to melt index ratio of at most 100 and (B) 50 to 10% by weight of a petroleum resin or linear low density polyethylene.
    Type: Grant
    Filed: November 30, 1988
    Date of Patent: August 27, 1991
    Assignee: TOA Nenryo Kogyo Kabushiki Kaisha
    Inventors: Yasushi Itaba, Yutaka Yoshifuji, Takayoshi Kondo, Keichiro Saitoh, Tadao Yoshino, Minoru Izawa, Ichiro Sakamoto
  • Process for producing a crosslinked and oriented polyethylene film
    Patent number: 4891173
    Abstract: A crosslinked and oriented polyethylene film superior in clarity as well as moistureproofness and having an improved stretchability is produced by a process for producing a crosslinked and oriented polyethylene film such that the degree of crosslinking inwardly decreases across the thickness of the film, comprising using a polyethylene having a density of at least 0.935 g/cm.sup.3, a melt index of 0.5 to 20 g/10 min and a high-load melt index to melt index ratio of 40 to 200.
    Type: Grant
    Filed: September 8, 1988
    Date of Patent: January 2, 1990
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Keichiro Saitoh, Yasushi Itaba, Minoru Izawa, Tadao Yoshino