Patents by Inventor Tomomi Nakatsugawa

Tomomi Nakatsugawa 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: 5907342
    Abstract: A recording method employing a medium that includes a substrate, and an ink-receiving layer provided thereon wherein the ink receiving layer contains water-insoluble and amorphous basic aluminum salt. In the recording medium, the basic aluminum salt is represented by the general formula (1) below:Al.sub.x (OH).sub.y X.sub.z (1)where x, y, and z are respectively positive integers and satisfy the relations of z=3x-y, and x/z.gtoreq.3, and X is an acid radical.
    Type: Grant
    Filed: October 21, 1992
    Date of Patent: May 25, 1999
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mamoru Sakaki, Tomomi Nakatsugawa, Hiroshi Sato
  • Patent number: 5459502
    Abstract: An ink jet recording method includes a step in which dots of inks of different colors are superposed on a preselected region on a recording medium to form a color image. The recording medium is composed of a liquid-absorbing substrate and a surface layer formed on the substrate. The surface layer is composed mainly of a pigment and a binder. The ink jet recording method is characterized in that dots of at least two inks of different colors are formed in superposition within a time interval of 0.3 seconds. Preferably, the pigment in the surface layer of the recording medium is basic magnesium carbonate.
    Type: Grant
    Filed: September 15, 1993
    Date of Patent: October 17, 1995
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mamoru Sakaki, Tomomi Nakatsugawa, Yutaka Kurabayashi
  • Patent number: 5362558
    Abstract: A recording medium for ink-jet recording has an ink-receiving layer comprising spherical basic magnesium carbonate, amorphous magnesium carbonate or a mixture of aluminum oxide and basic magnesium carbonate. The recording medium promises a good storage stability of recorded images, i.e. less deterioration due to indoor color changes, together with a high image density.
    Type: Grant
    Filed: June 25, 1993
    Date of Patent: November 8, 1994
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mamoru Sakaki, Yutaka Kurabayashi, Tomomi Nakatsugawa, Hiroshi Sato, Takahiro Shiratori
  • Patent number: 5277962
    Abstract: A recording medium comprises basic magnesium carbonate and a magnesium salt of silicic acid or of phosphorus oxy-acid. Ink-jet recording is conducted using the recording medium to obtain high image density without any problem such as indoor discoloration, white haze, fattening of letters, etc.
    Type: Grant
    Filed: May 20, 1992
    Date of Patent: January 11, 1994
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tomomi Nakatsugawa, Mamoru Sakaki, Yutaka Kurabayashi, Hiroshi Sato
  • Patent number: 5266383
    Abstract: A recording medium comprises a surface layer composed mainly of aluminum oxide particles and a lower layer having ink absorptivity. A recording medium comprises a surface layer composed mainly of aluminum oxide particles and a lower layer having ink absorptivity, and having a Stockigt sizing degree according to JIS-P-8122 of 0 to 15 sec. An ink jet recording method performs recording by imparting small droplets of an aqueous ink to a recording medium, wherein said aqueous ink contains an acidic dye and/or a direct dye, and said recording medium comprises a surface layer composed mainly of aluminum oxide particles and a lower layer having ink absorptivity. A recording medium comprises a surface layer composed mainly of aluminum oxide particles containing polyaluminum hydroxide and/or polyaluminum chloride and a lower layer having ink absorptivity. A recording medium comprises a surface layer composed mainly of aluminum oxide particles having particle sizes of 5 .mu.
    Type: Grant
    Filed: August 27, 1992
    Date of Patent: November 30, 1993
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mamoru Sakaki, Masako Shimomura, Megumi Munakata, Tomomi Nakatsugawa, Hiroshi Sato
  • Patent number: 5246774
    Abstract: A recording medium for ink-jet recording has an ink-receiving layer comprising spherical basic magnesium carbonate, amorphous magnesium carbonate or a mixture of aluminum oxide and basic magnesium carbonate. The recording medium promises a good storage stability of recorded images, i.e. less deterioration due to indoor color changes, together with a high image density.
    Type: Grant
    Filed: December 27, 1990
    Date of Patent: September 21, 1993
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mamoru Sakaki, Yutaka Kurabayashi, Tomomi Nakatsugawa, Hiroshi Sato, Takahiro Shiratori
  • Patent number: 5182175
    Abstract: A recording medium comprises a substrate, and an ink-receiving layer provided thereon wherein the ink receiving layer contains water-insoluble and amorphous basic aluminum salt. The recording medium according to claim 1, the basic aluminum salt is represented by the general formula (1) below:Al.sub.x (OH).sub.y X.sub.z (1)where x, y, and z are respectively positive integers and satisfy the relations of z=3x-y, and x/z.gtoreq.3, and X is an acid radical.
    Type: Grant
    Filed: April 3, 1990
    Date of Patent: January 26, 1993
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mamoru Sakaki, Tomomi Nakatsugawa, Hiroshi Sato
  • Patent number: 5137778
    Abstract: A recording medium comprises basic magnesium carbonate and a magnesium salt of silicic acid or of phosphorus oxy-acid. Ink-jet recording is conducted using the recording medium to obtain high image density without any problem such as indoor discoloration, white haze, fattening of letters, etc.
    Type: Grant
    Filed: June 6, 1991
    Date of Patent: August 11, 1992
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tomomi Nakatsugawa, Mamoru Sakaki, Yutaka Kurabayashi, Hiroshi Sato
  • Patent number: 4965612
    Abstract: An ink-jet recording system comprising applying droplets of water-based inks of a yellow ink, a magenta ink, a cyan ink and a black ink onto a recording medium comprising a substrate paper having a surface layer comprising a pigment and a fibrous substance of the substrate paper which are present in a mixed state, and said recording medium having a Stockigt sizing degree ranging from 0 to 15 seconds, to carry out recording, wherein;at least an ink with a dye concentration ranging from 2.5 to 4.5% by weight is used as said black ink; andthe recording is carried out in a maximum ink-adhering quantity ranging from 14 nl/mm.sup.2 to 20 nl/mm.sup.2 and in a maximum print-overlap number ranging from 2 to 2.5, is provided.
    Type: Grant
    Filed: October 31, 1989
    Date of Patent: October 23, 1990
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mamoru Sakaki, Tomomi Nakatsugawa, Shoji Koike, Hiroshi Sato