Patents by Inventor Charles Oakley Roberts

Charles Oakley Roberts 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).

  • Reduced icing valves and gas-driven motor and reciprocating pump incorporating same
    Patent number: 7367785
    Abstract: A valve for a gas-driven motor and a valve assembly and reciprocating pump incorporating the valve are provided. The valve includes a shiftable valve for alternatively supplying a motive gas through first and second supply ports to opposed first and second power pistons in opposed motive gas chambers, respectively, and for effecting alternating exhaust of said chambers. The shiftable valve has a front face with a valve projection located thereon and a rear face with a valve projection located thereon.
    Type: Grant
    Filed: March 19, 2004
    Date of Patent: May 6, 2008
    Assignee: Ingersoll-Rand Company
    Inventor: Charles Oakley Roberts