Patents Assigned to Norito Sudo
  • Porous film and porous film manufacturing apparatus
    Patent number: 5352108
    Abstract: This invention provides a porous film useful as a fresh fruit and vegetable wrapping material which is obtained by forming a large number of small recesses in an organic film and which does not allow permeation of water, bacteria, and viruses, but allows permeation of a gas, e.g., the oxygen gas or the carbon dioxide gas, and water vapor. The porous film includes the organic film and the large number of recesses formed in the organic film and having an average opening width of 0.5 .mu.m to 300 .mu.m and inner surfaces exhibiting affinity.
    Type: Grant
    Filed: October 9, 1992
    Date of Patent: October 4, 1994
    Assignees: Norito Sudo, Seiji Kagawa
    Inventors: Seiji Kagawa, Yoichiro Kagawa
  • Porous film manufacturing apparatus
    Patent number: 5257923
    Abstract: A porous film manufacturing apparatus is disclosed, which can continuously and uniformly form a large number of uniform through pores or blind pores, each having a size arbitrarily selected in the range of sub-.mu.m to several tens .mu.m, in an elongated film made of various types of materials, such as polymeric materials and metals, at a high density (e.g., 5,000 to 200,000 per cm.sup.2), without almost any deterioration in essential characteristics of the film materials.
    Type: Grant
    Filed: May 21, 1991
    Date of Patent: November 2, 1993
    Assignees: Norito Sudo, Seiji Kagawa
    Inventor: Seiji Kagawa