Patents by Inventor Douglas W. Ruffley

Douglas W. Ruffley 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).

  • Safety lock-out valve
    Patent number: 4000684
    Abstract: A lock-out valve for pneumatic systems which provides the operator with mechanical means to exhaust the system and lock it out with a padlock or similar device and, when unlocked, provides a valve to control automatically the gradual reset of working cylinders and the filling of the system with operating pressure to a safe percentage of line pressure before full line flow is established.
    Type: Grant
    Filed: March 27, 1975
    Date of Patent: January 4, 1977
    Assignee: Numatics, Incorporated
    Inventor: Douglas W. Ruffley