Patents by Inventor Charles L. Oldfather

Charles L. Oldfather 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).

  • Apparatus for and method of automatically cleaning an obstructed valve
    Patent number: 3991781
    Abstract: Waste water containing particulate matter is saturated with air or other gas by a dynamic mixer and ejected into a gravity filter system at a point above the filter media but below the water surface level. Upon entering the filter tank, the dissolved gas is released, forming small bubbles on filterable particles to float these particles to the surface for removal. The system further includes a back pressure valve at the sewage inlet port which, if obstructed, is automatically flushed. During the backwash cycle, the water level above the filter bed may be lowered to the level of a wash-through zone, and filtered water then pumped upward through the filter media, thereby carrying particles from the filter media out through the wash-through zone.
    Type: Grant
    Filed: November 17, 1975
    Date of Patent: November 16, 1976
    Inventors: Roderick M. Willis, Charles L. Oldfather
  • Apparatus for and method of filtering solid particles from a particulate-bearing liquid
    Patent number: 3977970
    Abstract: Waste water containing particulate matter is saturated with air or other gas by a dynamic mixer and ejected into a gravity filter system at a point above the filter media but below the water surface level. Upon entering the filter tank, the dissolved gas is released, forming small bubbles on filterable particles to float these particles to the surface for removal. The system further includes a back pressure valve at the sewage inlet port which, if obstructed, is automatically flushed. During the backwash cycle, the water level above the filter bed may be lowered to the level of a wash-through zone, and filtered water then pumped upward through the filter media, thereby carrying particles from the filter media out through the wash-through zone.
    Type: Grant
    Filed: December 23, 1974
    Date of Patent: August 31, 1976
    Assignee: Keystone Engineering & Products Co. Inc.
    Inventors: Roderick M. Willis, Charles L. Oldfather