Patents by Inventor Michael J. Dugan

Michael J. Dugan 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).

  • Method and apparatus for looping around a digital transmission line at a channel unit
    Patent number: 4688209
    Abstract: Method and apparatus for looping around a digital transmission line (150) at a predetermined channel unit (172) to test the line from either end of the line. Each channel unit in the line is responsive to a first and a second received control code to perform one of two operations. When the first and second received control codes are both first predetermined control codes from one end of the line, the data channel assumes a state to pass the second received first control code and any subsequently received control codes to the next channel unit. However, when the first and second received control codes are first and second predetermined control codes from the one end of the line, respectively, the data channel unit connects the transmit path from the one line end to the receive path back to the one line end, thus looping back to the digital transmission line.
    Type: Grant
    Filed: November 27, 1984
    Date of Patent: August 18, 1987
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Frederick J. Banzi, Jr., Michael J. Dugan, Randolph W. Johnson, Douglas D. Saylor, Craig A. Sharper
  • Loop around data channel unit
    Patent number: 4675862
    Abstract: A channel unit (172) for looping around a digital transmission line (150) in response to first and second received control codes. When the first and second received control codes are both first predetermined control codes from one end of the line, the data channel assumes a state to pass the second received first control code and any subsequently received control codes to the next channel unit. However, when the first and second received control codes are first and second predetermined control codes from the one end of the line, respectively, the data channel unit connects the transmit path from the one line end to the receive path back to the one line end, thus looping back the digital transmission line.
    Type: Grant
    Filed: November 27, 1984
    Date of Patent: June 23, 1987
    Assignee: American Telephone and Telegraph Company
    Inventors: Frederick J. Banzi, Jr., Michael J. Dugan, Craig A. Sharper