Patents by Inventor Katsuhiro Shirota

Katsuhiro Shirota 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).

  • Publication number: 20160280945
    Abstract: Provided is an ink jet ink capable of recording an image having an unprecedentedly high level of scratch resistance and excellent glossiness while satisfying reliability of the ink such as ejection stability. The ink jet ink contains at least a pigment and a graft polymer, and is characterized in that the graft polymer includes at least a specific nonionic unit and a unit having a polysiloxane structure.
    Type: Application
    Filed: June 14, 2016
    Publication date: September 29, 2016
    Inventors: Fumihiko Mukae, Katsuhiro Shirota, Yoshihisa Yamashita, Masashi Tsujimura, Katsuhiko Suzuki, Hiromitsu Kishi, Takashi Saito, Hirofumi Ichinose, Sayoko Nagashima
  • Patent number: 8469504
    Abstract: An object of the invention is to provide an ink set which enables to improve image density and scratch resistance of the images recorded using an ink containing a self-dispersion pigment and an ink containing a modified siloxane compound. An ink set to be used for ink jet recording including plural inks having a first ink and a second ink independently, wherein the first ink contains at least a pigment having functional groups on surface of pigment particles and a compound having adsorptivity to the pigment and the functional group density on the surface of the pigment particles is 1.5 ?mol/m2 or more and less than 2.6 ?mol/m2 and the second ink contains at least a pigment and a modified siloxane compound.
    Type: Grant
    Filed: July 30, 2009
    Date of Patent: June 25, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takashi Saito, Katsuhiro Shirota, Hirofumi Ichinose, Hiromitsu Kishi, Masashi Tsujimura, Fumihiko Mukae, Fumiaki Fujioka, Katsuhiko Suzuki, Sayoko Nagashima
  • Patent number: 8389600
    Abstract: Provided are an ink jet ink set, an ink jet recording method, and an ink jet recording apparatus each of which can reduce the graininess of an image to be recorded and improve the water fastness of the image even in a recording medium such as plain paper. The ink jet ink set has a first ink and a second ink independently, and is used so that the first and second inks overlap each other at least partly upon application of the inks to a recording medium. The first ink contains at least a pigment and a silicone oil. The second ink contains at least a pigment and a graft polymer that includes at least a nonionic unit represented by the general formula (I) and a unit having a polysiloxane structure.
    Type: Grant
    Filed: August 4, 2009
    Date of Patent: March 5, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Katsuhiko Suzuki, Katsuhiro Shirota, Hirofumi Ichinose, Masashi Tsujimura, Hiromitsu Kishi, Takashi Saito, Sayoko Nagashima, Fumihiko Mukae, Yoshihisa Yamashita
  • Patent number: 8013051
    Abstract: A liquid composition which can achieve superior scratch resistance of images at such a level that coloring materials are hardly scraped off even when images are scratched with finger nails under application of such strong pressure as to scratch a recording medium at its non-recorded areas. The liquid composition contains at least a modified siloxane compound having specific structure and a polymer whose acid value and hydrogen bond parameter (?h) are specified.
    Type: Grant
    Filed: February 5, 2008
    Date of Patent: September 6, 2011
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yuko Takada, Masashi Tsujimura, Katsuhiro Shirota, Shinichi Hakamada, Maiko Yamada, Sayoko Harigaya
  • Patent number: 7918928
    Abstract: A pigment ink is provided which has good ink reliability and storage stability and can achieve superior scratch resistance of images at such a level that coloring materials are hardly scraped off even when images are scratched with finger nails under application of such strong pressure as to scratch a recording medium at its non-recorded areas. The pigment ink contains a pigment, a modified siloxane compound having a specific structure, and a polymer whose acid value and hydrogen bond parameter (?h) are specified.
    Type: Grant
    Filed: February 5, 2008
    Date of Patent: April 5, 2011
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takashi Saito, Katsuhiro Shirota, Shinichi Hakamada, Masashi Tsujimura, Fumihiko Mukae, Katsuhiko Suzuki
  • Patent number: 7661786
    Abstract: An ink jet recording apparatus includes a recording head including a plurality of recording elements for ejecting ink in accordance with image data, wherein an image is formed by carrying out a recording scan N times for the same image area on a recording material, where N is an integer not less than 1, and a setting unit for setting a value of N in accordance with information relating to a glossiness of the recording material.
    Type: Grant
    Filed: April 6, 2005
    Date of Patent: February 16, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Koichiro Nakazawa, Takuei Ishikawa, Katsuhiro Shirota
  • Publication number: 20100033523
    Abstract: Provided are an ink jet ink set, an ink jet recording method, and an ink jet recording apparatus each of which can reduce the graininess of an image to be recorded and improve the water fastness of the image even in a recording medium such as plain paper. The ink jet ink set has a first ink and a second ink independently, and is used so that the first and second inks overlap each other at least partly upon application of the inks to a recording medium. The first ink contains at least a pigment and a silicone oil. The second ink contains at least a pigment and a graft polymer that includes at least a nonionic unit represented by the general formula (I) and a unit having a polysiloxane structure.
    Type: Application
    Filed: August 4, 2009
    Publication date: February 11, 2010
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Katsuhiko Suzuki, Katsuhiro Shirota, Hirofumi Ichinose, Masashi Tsujimura, Hiromitsu Kishi, Takashi Saito, Sayoko Nagashima, Fumihiko Mukae, Yoshihisa Yamashita
  • Publication number: 20100034972
    Abstract: Provided is an ink jet ink capable of recording an image having an unprecedentedly high level of scratch resistance and excellent glossiness while satisfying reliability of the ink such as ejection stability. The ink jet ink contains at least a pigment and a graft polymer, and is characterized in that the graft polymer includes at least a specific nonionic unit and a unit having a polysiloxane structure.
    Type: Application
    Filed: August 4, 2009
    Publication date: February 11, 2010
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Fumihiko Mukae, Katsuhiro Shirota, Yoshihisa Yamashita, Masashi Tsujimura, Katsuhiko Suzuki, Hiromitsu Kishi, Takashi Saito, Hirofumi Ichinose, Sayoko Nagashima
  • Publication number: 20100033522
    Abstract: An object of the invention is to provide an ink set which enables to improve image density and scratch resistance of the images recorded using an ink containing a self-dispersion pigment and an ink containing a modified siloxane compound. An ink set to be used for ink jet recording including plural inks having a first ink and a second ink independently, wherein the first ink contains at least a pigment having functional groups on surface of pigment particles and a compound having adsorptivity to the pigment and the functional group density on the surface of the pigment particles is 1.5 ?mol/m2 or more and less than 2.6 ?mol/m2 and the second ink contains at least a pigment and a modified siloxane compound.
    Type: Application
    Filed: July 30, 2009
    Publication date: February 11, 2010
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Takashi Saito, Katsuhiro Shirota, Hirofumi Ichinose, Hiromitsu Kishi, Masashi Tsujimura, Fumihiko Mukae, Fumiaki Fujioka, Katsuhiko Suzuki, Sayoko Nagashima
  • Patent number: 7413282
    Abstract: In both a full-line and a serial printer, the amount of ink passing through nozzles of print heads is sometimes decreased below a normal value before and during actual printing. In the printer of the present invention, a preliminary ejecting operation is performed taking the opportunity in which the amount of ink passing through nozzles is decreased below a normal value. Then, the amount of ink passing through nozzles recovers to the normal value in ink ejection after the preliminary ejecting operation. Since only a small amount of ink is ejected through the nozzles during the preliminary ejection operation, dots formed on a print sheet are not noticeable. Further, it is unnecessary to move the print heads to a home position where an ejection recovering process is executed to remove ink having an increased viscosity.
    Type: Grant
    Filed: January 3, 2006
    Date of Patent: August 19, 2008
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hitoshi Tsuboi, Katsuhiro Shirota, Noribumi Koitabashi, Yasunori Fujimoto
  • Publication number: 20080193659
    Abstract: A liquid composition which can achieve superior scratch resistance of images at such a level that coloring materials are hardly scraped off even when images are scratched with finger nails under application of such strong pressure as to scratch a recording medium at its non-recorded areas. The liquid composition contains at least a modified siloxane compound having specific structure and a polymer whose acid value and hydrogen bond parameter (?h) are specified.
    Type: Application
    Filed: February 5, 2008
    Publication date: August 14, 2008
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Yuko Takada, Masashi Tsujimura, Katsuhiro Shirota, Shinichi Hakamada, Maiko Yamada, Sayoko Harigaya
  • Publication number: 20080193647
    Abstract: A pigment ink is provided which has good ink reliability and storage stability and can achieve superior scratch resistance of images at such a level that coloring materials are hardly scraped off even when images are scratched with finger nails under application of such strong pressure as to scratch a recording medium at its non-recorded areas. The pigment ink contains a pigment, a modified siloxane compound having a specific structure, and a polymer whose acid value and hydrogen bond parameter (?h) are specified.
    Type: Application
    Filed: February 5, 2008
    Publication date: August 14, 2008
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Takashi Saito, Katsuhiro Shirota, Shinichi Hakamada, Masashi Tsujimura, Fumihiko Mukae, Katsuhiko Suzuki
  • Patent number: 7396120
    Abstract: A recording method performs recording on a recording medium using a pigment ink and a reaction liquid that has a higher surface tension than that of the pigment ink and contains a polyvalent metal salt capable of agglomerating the pigment ink. The method includes the steps of applying the reaction liquid on the recording medium, and bringing the pigment ink into contact with a surface of the reaction liquid that is present on the recording medium so that a filmy agglomerate, composed of an agglomeration of pigment aggregates produced by contact between the reaction liquid and the pigment ink, is formed on the surface of the reaction liquid applied on the recording medium.
    Type: Grant
    Filed: October 24, 2003
    Date of Patent: July 8, 2008
    Assignee: Canon Kabushiki Kaisha
    Inventors: Koichiro Nakazawa, Katsuhiro Shirota
  • Patent number: 7311394
    Abstract: A width A of the scanning area of the ink ejection orifices and a width B of the scanning area of the reacting liquid ejection orifices are respectively set as A=(n?a)×p and B=n×p, while amount of the feeding of the printing sheet during each scan corresponds to the width of the scanning area of the reacting liquid ejection orifices, that is, A=(n?a)×p. With this system, the width of the scanning area, wherein ejection of the reacting liquid precedes ejection of the ink, is made shorter by C=a×p than the width of following scanning area; the scanning area having the width C is scanned two times by the row of the ink ejection orifices, and the thinning process is applied to this area having the width C.
    Type: Grant
    Filed: May 6, 2004
    Date of Patent: December 25, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takuei Ishikawa, Kazuhiro Nakajima, Koichiro Nakazawa, Katsuhiro Shirota
  • Publication number: 20060176331
    Abstract: A width A of the scanning area of the ink ejection orifices and a width B of the scanning area of the reacting liquid ejection orifices are respectively set as A =(n?a)×n p and B=n×p, while amount of the feeding of the printing sheet during each scan corresponds to the width of the scanning area of the reacting liquid ejection orifices, that is, A=(n?a)×p. With this system, the width of the scanning area, wherein ejection of the reacting liquid precedes ejection of the ink, is made shorter by C=a×p than the width of following scanning area; the scanning area having the width C is scanned two times by the row of the ink ejection orifices, and the thinning process is applied to this area having the width C.
    Type: Application
    Filed: May 6, 2004
    Publication date: August 10, 2006
    Applicant: Canon Kabushiki Kaisha
    Inventors: Takuei Ishikawa, Kazuhiro Nakajima, Koichiro Nakazawa, Katsuhiro Shirota
  • Publication number: 20060109300
    Abstract: The present invention provides an ink jet printing apparatus and a preliminary ejecting method. In both a full-line and a serial printer, the amount of ink passing through nozzles of print heads is sometimes decreased below a normal value before and during actual printing. In the printer of present invention, a preliminary ejecting operation is performed taking the opportunity in which the amount of ink passing through nozzles is decreased below a normal value. Then, the amount of ink passing through nozzles recovers to the normal value at an ink ejection after the preliminary ejecting operation. Since only a small amount of ink is ejected through the nozzles during the preliminary ejection operation, dots formed on a print sheet are not noticeable. Further, it is unnecessary to move the print heads to a home position where an ejection recovering process is executed to remove ink having an increase viscosity.
    Type: Application
    Filed: January 3, 2006
    Publication date: May 25, 2006
    Applicant: Canon Kabushiki Kaisha
    Inventors: Hitoshi Tsuboi, Katsuhiro Shirota, Noribumi Koitabashi, Yasunori Fujimoto
  • Patent number: 7048356
    Abstract: A method and apparatus for ink jet printing enables a high grade image with the reduced ununiformity of colors to be inexpensively printed. A scan of a print head is executed to apply a reacting liquid to a print medium so that the number of reacting liquid dots impacting a unit area is reduced as the scan moves from a printing start-point of the reacting liquid to a printing end-point. Then, a scan of the print head is executed to apply the coloring inks to the area printed with the reacting liquid. Simultaneously, the reacting liquid is applied to an area which precedes by one band the area printed with coloring inks. Then, the coloring inks are applied. Simultaneously, the reacting liquid is applied to the area which precedes by one band the area printed with coloring inks. An image is formed by repeating the above steps.
    Type: Grant
    Filed: October 13, 2004
    Date of Patent: May 23, 2006
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takuei Ishikawa, Koichiro Nakazawa, Katsuhiro Shirota
  • Patent number: 7029095
    Abstract: The present invention provides an ink jet printing apparatus and a preliminary ejecting method. In both a full-line and a serial printer, the amount of ink passing through nozzles of print heads is sometimes decreased below a normal value before and during actual printing, In the printer of present invention, a preliminary ejecting operation is performed taking the opportunity in which the amount of ink passing through nozzles is decreased below a normal value. Then, the amount of ink passing through nozzles recovers to the normal value at an ink ejection after the preliminary ejecting operation. Since only a small amount of ink is ejected through the nozzles during the preliminary ejection operation, dots formed on a print sheet are not noticeable. Further, it is unnecessary to move the print heads to a home position where an ejection recovering process is executed to remove ink having an increase viscosity.
    Type: Grant
    Filed: November 13, 2001
    Date of Patent: April 18, 2006
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hitoshi Tsuboi, Katsuhiro Shirota, Noribumi Koitabashi, Yasunori Fujimoto
  • Publication number: 20060012627
    Abstract: To provide an inkjet recording method which not only prevents bleeding, but also drastically improves the color development of ink, while avoiding deterioration of fixing properties, overcomes the problem of strike-through of coloring ink on a recording medium, and is capable of high-speed printing. The recording method in which recording on a recording medium is performed by applying on the recording medium a reaction liquid containing a polyvalent metal salt and then applying thereon a pigment ink having a lower surface tension than that of the above reaction liquid, the method comprising the steps of bringing the reaction liquid into contact with the pigment ink on the top surface of the recording medium, and forming a filmy agglomerate composed of collective aggregates at the interface between the reaction liquid and the pigment ink in contact with each other.
    Type: Application
    Filed: October 24, 2003
    Publication date: January 19, 2006
    Inventors: Koichiro Nakazawa, Katsuhiro Shirota
  • Publication number: 20050219294
    Abstract: An ink jet recording apparatus includes a recording head including a plurality of recording elements for ejecting ink in accordance with image data, wherein an image is formed by carrying out recording scan N times for the same image area on a recording material, where N is an integer not less than 1; and setting means for setting a value of N in accordance with information relating to a glossiness of the recording material.
    Type: Application
    Filed: April 6, 2005
    Publication date: October 6, 2005
    Applicant: Canon Kabushiki Kaisha
    Inventors: Koichiro Nakazawa, Takuei Ishikawa, Katsuhiro Shirota