Patents by Inventor Hanh Luong

Hanh Luong 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).

  • Technique for connecting fax machines with advanced capabilities over a network which is not adapted to handle certain protocols
    Patent number: 7639403
    Abstract: An improved method and system for connecting Super Group 3 fax machines over network gateways that operate using the un-enhanced T.38 protocol. With the present invention, the CM tone is suppressed. Thus a gateway that generates an AnsAm tone, will not receive a CM tone in response. The T.38 protocol does not specify what occurs if a CM tone is not received; however, it has been found that, in practice, existing fax machines fall back to V.21 mode if a CM tone is not received.
    Type: Grant
    Filed: February 14, 2005
    Date of Patent: December 29, 2009
    Assignee: Cisco Technology, Inc.
    Inventors: Mehryar Khalili Garakani, Hanh Luong, Brooks S. Read, Steven J. White, Ilya Umansky, Herbert M. Wildfeuer
  • Controlling the transition glitch that occurs when a gateway switches from voice over IP to voice band data
    Patent number: 7058066
    Abstract: In a gateway router the length of the play-out buffer in VBD mode is not set at a previously established value. Instead the length of the play-out buffer in VBD mode is determined by the length of the buffer in the previous audio mode. When the system switches from audio mode to VDB mode, the length of the play-out buffer in audio mode is noted. The length of the play-out buffer in VBD mode is then set equal to its length in the prior audio mode plus a dilation factor. An audio concealment algorithm (which fills in gaps caused by missed packets) is used during the transition from audio to VDB to conceal any transition glitch during the answer tone.
    Type: Grant
    Filed: January 22, 2004
    Date of Patent: June 6, 2006
    Assignee: Cisco Technologies, Inc.
    Inventors: Mehryar Khalili Garakani, Nicholas Cutaia, Hanh Luong
  • Technique for connecting fax machines with advanced capabilities over a network which is not adapted to handle certain protocols
    Publication number: 20050168785
    Abstract: An improved method and system for connecting Super Group 3 fax machines over network gateways that operate using the un-enhanced T.38 protocol. With the present invention, the CM tone is suppressed. Thus a gateway that generates an AnsAm tone, will not receive a CM tone in response. The T.38 protocol does not specify what occurs if a CM tone is not received; however, it has been found that, in practice, existing fax machines fall back to V.21 mode if a CM tone is not received.
    Type: Application
    Filed: February 14, 2005
    Publication date: August 4, 2005
    Inventors: Mehryar Garakani, Hanh Luong, Brooks Read, Steven White, Ilya Umansky, Herbert Wildfeuer