Patents by Inventor David P. Sheffield

David P. Sheffield 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).

  • Emergency oxygen supply system
    Patent number: 5123409
    Abstract: An emergency oxygen supply system is disclosed in which a oxygen tank and valve body are mounted on a bracket including a pin maintaining a valve within the valve body in a position blocking fluid flow from the tank to an oxygen mask. Flow of oxygen from the oxygen tank to the oxygen mask is automatically actuated upon removal of the tank and valve body from the bracket, since the pin remains with the bracket, and the valve no longer blocks fluid flow. The valve also provides pressure regulation to prevent overly high pressures from passing from the oxygen tank to the oxygen mask.
    Type: Grant
    Filed: June 5, 1990
    Date of Patent: June 23, 1992
    Assignee: Scott Specialty Gases, Inc.
    Inventors: David P. Sheffield, Richard J. Boyles, Charles A. McMenamy