Patents by Inventor Tadashi Tomizawa

Tadashi Tomizawa 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).

  • Patent number: 6224971
    Abstract: Proposed are novel ink-jet recording sheet having high water resistance, excellent transparency of the ink-receptive layer, ink absorptivity and color developability as well as the advantages of absence of surface tackiness and blocking and a liquid coating composition for forming the ink-receptive coating layer of the recording sheet. The liquid coating composition comprises, as a uniform blend in an aqueous medium: (A) an acetoacetylated polyvinyl alcohol; (B) a polyvinylpyrrolidone resin; and (C) an acidic aqueous dispersion of a colloidal silica, each in a specified weight proportion, in a limited weight proportion.
    Type: Grant
    Filed: February 2, 1998
    Date of Patent: May 1, 2001
    Assignee: Somar Corporation
    Inventors: Tadashi Tomizawa, Sachiko Suzuki, Kuniaki Fukuhara, Naoki Sakazume
  • Patent number: 6013354
    Abstract: Provided by the invention is a recording film suitable for recording by using an ink-jet printer capable of giving very sharp printed images and having advantages of rapid drying of the water-base printing ink thereon and little re-transfer of the printed images directly after printing onto the surface coming into contact with the printed surface of the recording film. The recording film is a layered sheet material comprising (A) a base film of a plastic resin; (B) an ink-receptive layer formed from a mixture of a polyvinyl alcohol and a polyvinyl pyrrolidone; and (C) an overcoating layer on the ink-receptive layer. The overcoating layer is formed from a mixture of a water-insoluble polyvinyl acetal resin, fine particles of an acrylic resin and a polyvinyl pyrrolidone.
    Type: Grant
    Filed: June 30, 1998
    Date of Patent: January 11, 2000
    Assignee: Somar Corporation
    Inventors: Tadashi Tomizawa, Naoki Sakazume
  • Patent number: 5985425
    Abstract: An ink-jet recording film capable of exhibiting excellent ink fixing behavior in ink-jet printing with a water-base ink along with good water resistance of the recording layer, which has a double-layered structure, as formed on the surface of a plastic substrate film, consisting of (A) an ink-receptive layer comprising a water-soluble resin, e.g., polyvinyl alcohol, polyvinyl acetal and/or polyvinyl pyrrolidone, a surface-roughening agent which is a combination of two different silica powders distinguishable in the low and high values of oil absorption in a specified weight proportion and a crosslinking agent for the water-soluble resin and (B) an overcoating layer for dot-profile control consisting of an acrylic resin of the quaternary ammonium salt type.
    Type: Grant
    Filed: March 31, 1998
    Date of Patent: November 16, 1999
    Assignee: SOMAR Corporation
    Inventors: Tadashi Tomizawa, Yoshiomi Nakaya, Naoki Sakazume, Kenji Akuta