Patents by Inventor Masami Kihara

Masami Kihara 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).

  • Authentication server and authentication method by authentication server
    Patent number: 9185558
    Abstract: An authentication server capable of determining securely and accurately whether an access source is a cellular phone or a computer when a content is accessed with being limited to cellular phone users.
    Type: Grant
    Filed: November 2, 2011
    Date of Patent: November 10, 2015
    Assignee: NIHON UNIVERSITY
    Inventors: Masami Kihara, Takahiro Tsuchiya
  • AUTHENTICATION SERVER AND AUTHENTICATION METHOD BY AUTHENTICATION SERVER
    Publication number: 20130232550
    Abstract: An authentication server capable of determining securely and accurately whether an access source is a cellular phone or a computer when a content is accessed with being limited to cellular phone users.
    Type: Application
    Filed: November 2, 2011
    Publication date: September 5, 2013
    Applicant: NIHON UNIVERSITY
    Inventors: Masami Kihara, Takahiro Tsuchiya
  • Propagation delay time measuring system
    Patent number: 8289871
    Abstract: A propagation delay time measuring system 100 includes a propagation delay time measuring apparatus 110 and a reply apparatus 120. The propagation delay time measuring apparatus 110 continuously transmits plural measuring packets a. A clock time of transmission is stored in the measuring packet a. The reply apparatus 120 sends back the measuring packets a, transmitted from the propagation delay time measuring apparatus 110, to the propagation delay time measuring apparatus 110. In the propagation delay time measuring system 100, the propagation delay time measuring apparatus 110 receives the measuring packets a sent back from the reply apparatus 120, and the propagation delay time measuring apparatus 110 measures a propagation delay time between the propagation delay time measuring apparatus 110 and the reply apparatus 120 using at least one of the received measuring packets a.
    Type: Grant
    Filed: December 25, 2007
    Date of Patent: October 16, 2012
    Assignee: Nihon University
    Inventor: Masami Kihara
  • PROPAGATION DELAY TIME MEASURING SYSTEM
    Publication number: 20100195517
    Abstract: A propagation delay time measuring system 100 includes a propagation delay time measuring apparatus 110 and a reply apparatus 120. The propagation delay time measuring apparatus 110 continuously transmits plural measuring packets a. A clock time of transmission is stored in the measuring packet a. The reply apparatus 120 sends back the measuring packets a, transmitted from the propagation delay time measuring apparatus 110, to the propagation delay time measuring apparatus 110. In the propagation delay time measuring system 100, the propagation delay time measuring apparatus 110 receives the measuring packets a sent back from the reply apparatus 120, and the propagation delay time measuring apparatus 110 measures a propagation delay time between the propagation delay time measuring apparatus 110 and the reply apparatus 120 using at least one of the received measuring packets a.
    Type: Application
    Filed: December 25, 2007
    Publication date: August 5, 2010
    Applicant: Nihon University
    Inventor: Masami Kihara
  • Phase synchronization system
    Patent number: 5673133
    Abstract: The invention has the object of offering a phase synchronization system for wavelength division multiplexed bi-directional communications systems which can perform high-precision phase synchronization between a master device and a slave device without being affected by chromatic dispersion within the optical transmission medium. FIG. 1 is a block diagram showing the structure of an embodiment of the phase synchronization system of the invention. The phase synchronization system switches between phase difference measurement between optical signals of two different wavelengths which propagate in opposite directions and phase difference measurement between optical signals of the two different wavelengths which propagate in the same direction. By comparing the data indicating the phase difference, the system determines the delay time between the master device and the slave device.
    Type: Grant
    Filed: April 11, 1996
    Date of Patent: September 30, 1997
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Atsushi Imaoka, Masami Kihara