Patents by Inventor David H. Stafford

David H. Stafford 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: 9398072
    Abstract: In a KVM system, a system provides for USB devices to be accessed by target computers. A KVM switch connects a client with a target server via a network, the client computer having at least one device attached thereto. A second mechanism connects to a USB port of the target and communicates with the target using a USB protocol. A client mechanism communicates with the second mechanism via the network. A virtual media mechanism enables the target server to access the USB device attached to the client.
    Type: Grant
    Filed: November 13, 2009
    Date of Patent: July 19, 2016
    Assignee: Avocent Corporation
    Inventors: Steven Blackwell, Christopher L. Thomas, Philip M. Kirshtein, David H. Stafford, James Vernon Pursel, Paul D. Durden
  • Publication number: 20100077118
    Abstract: In a KVM system, a system provides for USB devices to be accessed by target computers. A KVM switch connects a client with a target server via a network, the client computer having at least one device attached thereto. A second mechanism connects to a USB port of the target and communicates with the target using a USB protocol. A client mechanism communicates with the second mechanism via the network. A virtual media mechanism enables the target server to access the USB device attached to the client.
    Type: Application
    Filed: November 13, 2009
    Publication date: March 25, 2010
    Inventors: Steven Blackwell, Christopher L. Thomas, Philip M. Kirshtein, David H. Stafford, James Pursel, Paul D. Durden
  • Publication number: 20100057956
    Abstract: In a KVM system, a system provides for USB devices to be accessed by target computers. A KVM switch connects a client with a target server via a network, the client computer having at least one device attached thereto. A second mechanism connects to a USB port of the target and communicates with the target using a USB protocol. A client mechanism communicates with the second mechanism via the network. A virtual media mechanism enables the target server to access the USB device attached to the client.
    Type: Application
    Filed: November 13, 2009
    Publication date: March 4, 2010
    Inventors: Steven Blackwell, Christopher L. Thomas, Philip M. Kirshtein, David H. Stafford, James Pursel, Paul D. Durden
  • Patent number: 7640382
    Abstract: In a KVM system, a system provides for USB devices to be accessed by target computers. A KVM switch connects a client with a target server via a network, the client computer having at least one device attached thereto. A second mechanism connects to a USB port of the target and communicates with the target using a USB protocol. A client mechanism communicates with the second mechanism via the network. A virtual media mechanism enables the target server to access the USB device attached to the client.
    Type: Grant
    Filed: April 25, 2006
    Date of Patent: December 29, 2009
    Assignee: Avocent Corporation
    Inventors: Steven Blackwell, Christopher L. Thomas, Philip M. Kirshtein, David H. Stafford, James Vernon Pursel, Paul D. Durden
  • Patent number: 6671756
    Abstract: A KVM switch having a uniprocessor architecture that accommodate multiple users and multiple computers—even multiple users to a single computer—via interrupt servicing provides dramatic improvements over common matrix-type KVM switches. Further, such features as hot-plugging computers, and keep alive computers (during power outages) are not inhibited by the present architecture. OSD menuing is accommodated, even as to both users, and OSD configurations are field upgradeable using flash memory downloading. The present architecture also accommodates tiered arrangements.
    Type: Grant
    Filed: May 5, 2000
    Date of Patent: December 30, 2003
    Assignee: Avocent Corporation
    Inventors: Christopher L. Thomas, Douglas D. Reed, David H. Stafford, Philip M. Kirshtein
  • Patent number: 6378009
    Abstract: An apparatus, method, and system for providing control, status, and security functions in a peripheral switch for connecting one or more computers to one or more user stations. Information from a remote terminal is transferred on a network in a packet where the switch information in the packet uses a standardized management protocol. When the packet is received by a network interface card in the peripheral switch the switch information is translated to a proprietary protocol. The peripheral switch then responds to the switch information by performing a control function, providing status information to the remote terminal, or by changing security information. In addition to the transfer of peripheral information from the remote terminal, the peripheral switch is capable of transferring switch information from one of the user stations.
    Type: Grant
    Filed: August 20, 1999
    Date of Patent: April 23, 2002
    Assignee: Avocent Corporation
    Inventors: William J. Pinkston, II, Charles H. Williams, Paul D. Durden, David H. Stafford
  • Patent number: 6256014
    Abstract: A multi-user KVM switch system is disclosed in which the KVM switch utilizes a pre-determined routine to determine which types of mice are connected to the KVM switch user ports. When the multiple mice communicate with a common computer via the KVM switch, the present invention provides a hierarchical mouse ranking structure which the KVM switch 13 uses to determine which of the disparate mouse driver types the KVM switch will emulate to the commonly selected computer. In this manner, disparate mouse types speaking to a common KVM switch and to a commonly selected computer by a mouse emulation type which is advantageously selected from a hierarchical ranking of mouse types in flash memory of the KVM switch.
    Type: Grant
    Filed: May 5, 2000
    Date of Patent: July 3, 2001
    Assignee: Avocent Corporation
    Inventors: Christopher L. Thomas, Douglas D. Reed, David H. Stafford, Mark M. Nicolas
  • Patent number: 4583391
    Abstract: A simple, rugged, and conveniently front-adjustable gage stop having a gage finger capable of presenting a gage face in any of several angular orientations is disclosed. The gage stop comprises a gage finger adjustably and rotatably connected to a finger support which is in turn pivotally connected to a mounting member. In operation, a workpiece is butted against the gage face with the gage stop resting in a horizontal orientation, and some operation is performed on the workpiece. If this operation results in an upward force being applied to the gage stop, the stop swings upward in response, to a limiting position in which the center of gravity of the finger support/gage finger combination is forward of the pivot axis, and then returns by gravity to a horizontal position.
    Type: Grant
    Filed: September 20, 1984
    Date of Patent: April 22, 1986
    Assignee: Dynamics Research Corporation
    Inventor: David H. Stafford