Patents by Inventor Stephen Christman

Stephen Christman 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).

  • Gas flow stop device
    Patent number: 6564820
    Abstract: The present invention provides a reliable regulating device that permits liquids, such as fuel oils, to be drained into the enclosure while preventing the flow of gases into the enclosure. The device includes a valve housing having a chamber for receiving the liquids and the gases and a drain valve means in open flow communication with the liquids and gases. The drain valve means includes a valve seat and a float member both located within the valve housing. The float member has a specific gravity less than the liquids passing through the device. The float member floats off the valve seat when the liquids flow through the valve housing and engages the valve seat when gases are present in the chamber preventing the gases from entering the enclosure.
    Type: Grant
    Filed: October 9, 2001
    Date of Patent: May 20, 2003
    Assignee: United Technologies Corporation
    Inventor: Stephen Christman
  • Gas flow stop device
    Publication number: 20030066561
    Abstract: The present invention provides a reliable regulating device that permits liquids, such as fuel oils, to be drained into the enclosure while preventing the flow of gases into the enclosure. The device includes a valve housing having a chamber for receiving the liquids and the gases and a drain valve means in open flow communication with the liquids and gases. The drain valve means includes a valve seat and a float member both located within the valve housing. The float member has a specific gravity less than the liquids passing through the device. The float member floats off the valve seat when the liquids flow through the valve housing and engages the valve seat when gases are present in the chamber preventing the gases from entering the enclosure.
    Type: Application
    Filed: October 9, 2001
    Publication date: April 10, 2003
    Inventor: Stephen Christman