Patents by Inventor Calvin E. Piilola

Calvin E. Piilola 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 bag clamp
    Patent number: 4512789
    Abstract: Apparatus is disclosed for securing a filter bag in hanging suspension through an opening in a baffle plate in a bag housing, including a cover plate having an upwardly extending mouth and a downwardly extending sleeve, a pair of U-shaped clamps constraining the bag against the cover plate, and tensile spring members connected between the U-shaped clamps and over the cover plate.
    Type: Grant
    Filed: January 9, 1984
    Date of Patent: April 23, 1985
    Assignee: General Resource Corporation
    Inventors: Douglas L. Pettit, Calvin E. Piilola