Patents by Inventor David H. Swallow

David H. Swallow 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).

  • Boiler hydraulic column choke and reamer with burner control protection against a low water condition
    Patent number: 4850309
    Abstract: An improved hydraulic column choke valve and reamer, adapted to hot water heating boilers and the like, permitting maintenance on low water fuel cut-off controls and similar columns without draining the boiler, characterized by a universal valve body and locking mechanism which interchangeably mounts a reaming assembly and/or choke assembly, the latter of which may be retained in the column after removal of the valve body. The water column choke is adapted to columns of variant horizontal cross-section without exchange of the valve body, per se. Suplemental to the basic choke valve is the adaptation of an electric low water cut-off control, useful as and when the water column may be isolated from the boiler.
    Type: Grant
    Filed: September 14, 1988
    Date of Patent: July 25, 1989
    Inventor: David H. Swallow
  • Hydraulic column choke and reamer
    Patent number: 4488515
    Abstract: An hydraulic column choke valve and reamer adapted to hot water heating boilers and the like, permitting maintenance on low water fuel cut-off controls and similar columns without draining, characterized by a universal valve body which interchangeably mounts a reaming assembly and/or choke assembly, the latter of which may be retained in the column after removal of the valve body. The water column choke is adapted to columns of variant horizontal cross section without exchange of the valve body, per se.
    Type: Grant
    Filed: July 5, 1983
    Date of Patent: December 18, 1984
    Inventor: David H. Swallow