Patents by Inventor Keith Crofut

Keith Crofut 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).

  • Filter for filtering solids out of a liquid having a doctor blade wiping means
    Patent number: 4880539
    Abstract: A pressurized tank filter for filtering oversized solids from a liquid wherein fluid passes through a filter media on which oversized solids are collected. A doctor blade assembly is provided for biasly engaging the filter and accumulating the solids collected thereon, where upon on each rotation of the doctor blade they engage a wiper means which causes a cleaning thereof.
    Type: Grant
    Filed: October 16, 1987
    Date of Patent: November 14, 1989
    Assignee: Cellier Corporation
    Inventors: John E. Crawford, Keith Crofut