Patents by Inventor John P. Hufnagel

John P. Hufnagel 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).

  • Full service voice/data system
    Patent number: 4719617
    Abstract: A full service voice/data system includes a networking medium having a plurality of substantially identical subsystems interconnected thereto. Each subsystem includes a local voice information path and a local data information path, the local data information path including a masterless multiple access contention bus with collision detection.
    Type: Grant
    Filed: February 25, 1985
    Date of Patent: January 12, 1988
    Assignee: U.S. Holding Company
    Inventors: John A. Yanosy, Jr., Jitender K. Vij, John P. Hufnagel, Paul Oldyzko, Anthony J. Dennett
  • Apparatus and method for executing communication protocol conversions
    Patent number: 4677611
    Abstract: An apparatus for efficiently executing communication protocol conversions includes a plurality of peripheral interface devices each executing only a single communication protocol conversion whereby the processing capacity required is reduced for each such device. In addition, a single network wide uniform communication protocol is incorporated within each apparatus.
    Type: Grant
    Filed: February 25, 1985
    Date of Patent: June 30, 1987
    Assignee: ITT Corporation
    Inventors: John A. Yanosy, Jr., Anthony J. Dennett, John P. Hufnagel
  • Method and apparatus for detecting a blood leak in a hemodialysis system
    Patent number: 4166961
    Abstract: A blood leak in the dialyzer is detected by transmitting a pulsed beam of light into the dialysate flowstream at a predetermined angle of incidence between the central axis of the flowstream and the normal axis and measuring variations in reflecting light received by a photodetector arranged on the same side of the flowstream as the phototransmitter at a predetermined angle of reflection. The beam of light is interupted at a rate with a substantially equal on-time to off time ratio.
    Type: Grant
    Filed: March 22, 1978
    Date of Patent: September 4, 1979
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Naim G. Dam, John P. Hufnagel