Patents by Inventor Yuan-Yu Cheng

Yuan-Yu Cheng 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: 8182252
    Abstract: A progressing cavity pump system including a rotor and a stator having an inner cavity. The rotor is rotationally disposed inside the inner cavity of the stator such that rotation of the rotor relative to the stator causes material in the inner cavity to be pumped through the stator. The stator includes at least two radially separable stator portions such that when at least one of the stator portions is removed, at least one of the rotor or the inner cavity is exposed.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: May 22, 2012
    Assignee: Moyno, Inc.
    Inventors: Michael D. Amburgey, Yuan Yu Cheng
  • Publication number: 20090110578
    Abstract: A progressing cavity pump system including a rotor and a stator having an inner cavity. The rotor is rotationally disposed inside the inner cavity of the stator such that rotation of the rotor relative to the stator causes material in the inner cavity to be pumped through the stator. The stator includes at least two radially separable stator portions such that when at least one of the stator portions is removed, at least one of the rotor or the inner cavity is exposed.
    Type: Application
    Filed: October 30, 2007
    Publication date: April 30, 2009
    Applicant: MOYNO, INC.
    Inventors: Michael D. Amburgey, Yuan Yu Cheng
  • Patent number: 7451479
    Abstract: A network apparatus with secure IPSec mechanism and method for operating the same are disclosed. The network apparatus includes a VLAN, an MAC filter, an IP restriction unit and a static DHCP. The network apparatus provides physical separation between VPN and other untrustful network before a message is sent to an IPSec channel. Therefore, the IPSec channel can be securely accessed. The network apparatus is applicable for both household network and VPN.
    Type: Grant
    Filed: February 28, 2005
    Date of Patent: November 11, 2008
    Assignee: Zyxel Communications Corporation
    Inventors: Yao-Chih Yeh, Yuan-Yu Cheng, Hsin-Hao Cheng, Chia-Yuan Chen
  • Publication number: 20060195900
    Abstract: A network apparatus with secure IPSec mechanism and method for operating the same are disclosed. The network apparatus includes a VLAN, an MAC filter, an IP restriction unit and a static DHCP. The network apparatus provides physical separation between VPN and other untrustful network before a message is sent to an IPSec channel. Therefore, the IPSec channel can be securely accessed. The network apparatus is applicable for both household network and VPN.
    Type: Application
    Filed: February 28, 2005
    Publication date: August 31, 2006
    Inventors: Yao-Chih Yeh, Yuan-Yu Cheng, Hsin-Hao Cheng, Chia-Yuan Chen