Patents by Inventor John E. Leddy

John E. Leddy 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).

  • Patent number: 6339859
    Abstract: An adjustable splitter valve and control system for a pulp washing apparatus is provided that automatically regulates the filtrate flow from a pulp washer or thickener to control the filtrate characteristics such as volume, dissolved solids or suspended solids. By detecting or sensing a control parameter in the discharge piping and utilizing a feedback loop, the system will adjust the filtrate split to compensate for variations in the machine operation and feed stock.
    Type: Grant
    Filed: June 25, 1999
    Date of Patent: January 22, 2002
    Inventors: Lewis D. Shackford, John E. Leddy
  • Patent number: 5242590
    Abstract: A rotating disc filter has a plurality of sectors removably mounted on drainage and support structures which are fixed on a rotating hub. The drainage and support structure has flow channels and internal baffles which serve to trap filtrate to keep filtrate from re-wetting filter cake built up on the sectors prior to removal of the filter cake from the sectors.
    Type: Grant
    Filed: July 31, 1992
    Date of Patent: September 7, 1993
    Assignee: Ingersoll-Rand Company
    Inventors: William F. Thomson, Alfred F. Blichmann, John E. Leddy