Patents by Inventor Emmet Chen

Emmet Chen 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).

  • Apparatus for scanning documents in front of a document plate
    Patent number: 6721072
    Abstract: The present invention provides a scanning device. The scanning device comprises a document plate for placing a document, at least a sliding guide placed at one side of the document plate, a scanning module which is in front of the document plate for scanning the document along the direction of the sliding guide, a first light source assembled in the scanning module for providing light to scan documents, and a driving module electrically connected to the scanning module for driving the scanning module to perform scanning procedure to the document.
    Type: Grant
    Filed: September 13, 2000
    Date of Patent: April 13, 2004
    Assignee: Mustek Systems Inc.
    Inventors: Jenn-Tsair Tsai, Albert Lu, Emmet Chen
  • Method and structure for coupling a step motor shaft
    Patent number: 6287203
    Abstract: A method and structure for coupling to a step motor shaft is characterized by providing a predetermined back-lash distance defined between the step motor shaft and a key, thereby to instantly reach the desired speed for driving a load. Accordingly, a shaft coupling device is provided to connect to a rotatable load. The shaft coupling device has a key which maintains a back-lash distance defined between a step motor shaft and the key. Eventually, when the step motor shaft is not driving the load, they are separated. When the step motor shaft is driven by the step motor, it self-spins in a first direction and travels through a distance so as to form a predetermined back-lash distance between the key. As soon as the back-lash distance is formed, the step motor shaft reverses its rotation direction and then starts to travel through the predetermined back-lash distance to drive the load. The speed of the step motor shaft soon increases as it rotates in a second direction and approaches the load.
    Type: Grant
    Filed: October 26, 1999
    Date of Patent: September 11, 2001
    Assignee: Mustek Systems Inc.
    Inventors: Bill Chen, Emmet Chen, Te-Chih Chang
  • Apparatus for scanning documents in front of a document plate
    Patent number: RE40974
    Abstract: The present invention provides a scanning device. The scanning device comprises a document plate for placing a document, at least a sliding guide placed at one side of the document plate, a scanning module which is in front of the document plate for scanning the document along the direction of the sliding guide, a first light source assembled in the scanning module for providing light to scan documents, and a driving module electrically connected to the scanning module for driving the scanning module to perform scanning procedure to the document.
    Type: Grant
    Filed: April 13, 2006
    Date of Patent: November 17, 2009
    Inventors: Jenn-Tsair Tsai, Albert Lu, Emmet Chen