Patents by Inventor Kazuhiko Muramoto

Kazuhiko Muramoto 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).

  • Method for facilitating legitimate use of digital content
    Patent number: 6965996
    Abstract: Method of data operation facilitating utilization of legitimate users without violating the copyright and literary property of digital content. A part of digital content (11) is duplicated to create discrete data unit (43), and is encrypted with content key (45). Content key (45) and image-compositing information (42) are encrypted with secret key (47) to create authorization information (48). Content information (41) is visibly embedded in digital content (11). Authorization information-added data unit (50) in which authorization information (48) is embedded as invisible information and encrypted discrete data unit information (46) are composited into composite data (60), which is then distributed.
    Type: Grant
    Filed: November 30, 2000
    Date of Patent: November 15, 2005
    Assignee: Fujitsu Limited
    Inventors: Hideyuki Hirano, Seigo Kotani, Shinji Hashimoto, Kazuhiko Muramoto
  • Method for facilitating legitimate use of digital content
    Publication number: 20010004736
    Abstract: Method of data operation facilitating utilization of legitimate users without violating the copyright and literary property of digital content. A part of digital content (11) is duplicated to create discrete data unit (43), and is encrypted with content key (45). Content key (45) and image-compositing information (42) are encrypted with secret key (47) to create authorization information (48). Content information (41) is visibly embedded in digital content (11). Authorization information-added data unit (50) in which authorization information (48) is embedded as invisible information and encrypted discrete data unit information (46) are composited into composite data (60), which is then distributed.
    Type: Application
    Filed: November 30, 2000
    Publication date: June 21, 2001
    Inventors: Hideyuki Hirano, Seigo Kotani, Shinji Hashimoto, Kazuhiko Muramoto
  • Fine particulate crystalline aluminum orthophosphate and method for preparing same
    Patent number: 4542001
    Abstract: A fine particulate crystalline aluminum orthophosphate is obtained by reacting an aqueous phosphoric acid solution with an aluminum oxide under heating in an organic solvent which is incompatible with water.
    Type: Grant
    Filed: August 22, 1983
    Date of Patent: September 17, 1985
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Shinji Iino, Kensaku Maruyama, Motoi Takenaga, Kazuhiko Muramoto, Mitsutomo Tsuhako