Patents by Inventor James L. Berkhoel

James L. Berkhoel 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: 6090173
    Abstract: A method of cleaning a filter element includes discharging a quantity of pressurized air from a blow pipe into a Venturi element in air flow communication with a filter element to provide a positive cleaning pressure differential along greater than 95% of a length of the filter element. In one arrangement, an air filter assembly for accomplishing this method comprises a housing, a first filter construction, a first Venturi element, and a pulse jet cleaning system including a blow pipe. The blow pipe and the Venturi element are constructed and arranged to provide a positive cleaning pressure differential along greater than at least 75% of the length of the filter media within the element. In one embodiment, the Venturi element is described as including a specially formed contoured section in the throat portion of the element.
    Type: Grant
    Filed: August 7, 1998
    Date of Patent: July 18, 2000
    Assignee: Donaldson Company, Inc.
    Inventors: Steven A. Johnson, Thomas D. Raether, James L. Berkhoel
  • Patent number: 4792344
    Abstract: Method and apparatus for filtering air are disclosed. A preferred cabinet collector (10) according to the invention includes a housing defining an upper chamber (b 20a) and a lower chamber (20b). Separating the chambers (20a, 20b) are a pair of wedge-shaped filter assemblies (38, 38'). First ends (42, 42') of the filter assemblies (38, 38') are attached the housing wherein second ends (44, 44') are free. Provision is made to automatically periodically move the second ends (44, 44') to clean the filter media, filter displacement apparatus "snapping" the filter assemblies (38, 38') and another displacement apparatus "vibrating" the filter assemblies (38, 38') to achieve the desired media cleaning.
    Type: Grant
    Filed: January 19, 1988
    Date of Patent: December 20, 1988
    Assignee: Donaldson Company, Inc.
    Inventors: Mark D. Belcher, James L. Berkhoel, Bruce A. Hampel
  • Patent number: 4209310
    Abstract: A novel arrangement for mounting the filter elements of an air filter in a manner which facilitates their removal and replacement without tools or accessories.
    Type: Grant
    Filed: October 5, 1978
    Date of Patent: June 24, 1980
    Assignee: Donaldson Company, Inc.
    Inventor: James L. Berkhoel
  • Patent number: 4199334
    Abstract: An apparatus for filtering particulate material from air and for removing the particulate material collected upon a filter is disclosed. The apparatus includes a housing having an inlet and an outlet. A hollow longitudinally extending filter is secured within the housing for filtering particulate material from the air passing from the inlet to the outlet. The hollow filter has a relatively rigid configuration but still is capable of being distorted. The hollow filter is formed of a pleated porous material. One longitudinal end of the filter is secured relative to the housing and a closure plate is secured to the other longitudinal end. A mechanism is provided for moving the plate to distort the filter and remove particulate material collected thereon.
    Type: Grant
    Filed: May 26, 1978
    Date of Patent: April 22, 1980
    Assignee: Donaldson Company, Inc.
    Inventor: James L. Berkhoel