Patents by Inventor Duc Tich Doan

Duc Tich Doan 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).

  • System for controlling connection requests by each IO controllers storing and managing a request queue wherein additional channel addresses can be added
    Patent number: 5878278
    Abstract: A data processing system includes a central processing complex consisting of one or more processor units, each of the processor units having one or more input/output channels, a transmission medium connected to each of the input/output channels, and one or more peripheral device controllers such as for controlling one or more direct access storage devices (DASD). In systems having more than one input/output channels, it is common to include a switching mechanism connected between the input/output channels and the control devices for enabling connection between one of a number of controllers and one of a number of channels. Each control device will include an automatic frame transmission function which includes apparatus and method for controlling transmission of frames of information between the control device and the channel. A queue of reconnection requests is constructed and a state machine controls the queue.
    Type: Grant
    Filed: July 12, 1996
    Date of Patent: March 2, 1999
    Assignee: International Business Machines Corporation
    Inventors: Paul Peixoto Carreiro, Alena Chang, Duc Tich Doan, Robert R. Fish