Patents by Inventor Robert W. Maddock

Robert W. Maddock 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).

  • Oxygen supply system and flow indicator
    Patent number: 4098271
    Abstract: A flow indicator for use in a continuous flow type oxygen apparatus. The flow indicator constructed of a flexible chamber and restrictor to give an immediate visual indication of a minimum acceptable oxygen flow within the system.
    Type: Grant
    Filed: December 3, 1976
    Date of Patent: July 4, 1978
    Assignee: McDonnell Douglas Corporation
    Inventor: Robert W. Maddock