Patents by Inventor Donald F. Engel

Donald F. Engel 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: 7396375
    Abstract: An air cleaner (40) includes a housing (48) and an access cover. The internal volume of the housing (48) can be reached through an opening (70) in a side wall of the housing. A filter element (50) having fluted filter media is removable and replaceable from the air cleaner (40). The housing is constructed and arranged to cam the element (50) into sealing engagement with the housing (48). The access cover includes structure to help support and ensure proper seating of the filter element within the housing. A method of installing the filter element in the air cleaner includes sliding a portion of the filter element against a slide surface in the housing. A method of servicing an air cleaner includes tilting the filter element against a tilt surface in the housing to release a seal between the filter element and the housing. The filter element can have a handle to assist in servicing of the air cleaner.
    Type: Grant
    Filed: May 8, 2003
    Date of Patent: July 8, 2008
    Assignee: Donaldson Company, Inc.
    Inventors: Larry R. Nepsund, Bradley A. Kuempel, Donald F. Engel, Bruce Allen Boehrs, Sheldon Anderson, Richard L. Bucholtz, Thomas John Lundgren
  • Patent number: 5613992
    Abstract: A reverse flow air filter arrangement is provided. The arrangement includes a filter element having first and second end caps, the second end cap having a central drainage aperture. A funnel shape on an interior surface of second end cap is used to direct moisture flow to the drainage aperture. The arrangement includes a housing in which the filter element is positioned, operatively, during use. Certain features in the housing facilitate moisture withdrawal from the filter element while also inhibiting interference with sealing between the filter element and the housing.
    Type: Grant
    Filed: November 23, 1994
    Date of Patent: March 25, 1997
    Assignee: Donaldson Company, Inc.
    Inventor: Donald F. Engel
  • Patent number: 5137308
    Abstract: An air flow conduit system is presented for air flow communicatoin between an air filter mechanism and an engine intake manifold. The conduit system comprises substantially rigid straight conduit members joined in fluid communication by connector systems having elbow-shaped conduit members. A narrow end of a conduit member is received within a broad end of a next adjacent conduit member. Sealing engagement occurs by means of an elastomeric seal member having ribs thereon positioned radially between the inner and outer conduits. A preferred rib arrangement is provided, to insure a flexible, multipoint, seal system.
    Type: Grant
    Filed: July 26, 1990
    Date of Patent: August 11, 1992
    Assignee: Donaldson Company, Inc.
    Inventors: Donald F. Engel, Steven S. Gieseke
  • Patent number: 5129685
    Abstract: An air flow conduit system is presented for air flow communication between an air filter mechanism and an engine intake manifold. The conduit system comprises substantially rigid straight conduit members joined in fluid communication by connector systems having elbow-shaped conduit members. A narrow end of a conduit member is received within a broad end of a next adjacent conduit member. Sealing engagement occurs via an elastomeric seal member having ribs thereon positioned radially between the inner and outer conduits. A preferred rib arrangement is provided, to insure a flexible, multi-point, seal system.
    Type: Grant
    Filed: February 23, 1990
    Date of Patent: July 14, 1992
    Assignee: Donaldson Company, Inc.
    Inventor: Donald F. Engel
  • Patent number: 5123795
    Abstract: A quarter turn fastener (10) fastens a first component (12) to a second component (14). The fastener (10) has a cap (20) covering and rotating about a cylindrical mounting member (24) with a spring (34) therebetween. The mounting member (24) attaches to the first component (12) by barbs (28). Rotation is limited by a slot and tab arrangement having a tab (42) extending inward from the cap (20) into a slot (44) in the mounting member (24). The slot (44) extends one fourth of the way around the circumference of the mounting member (24) for limiting rotation and includes ridges (46, 48) preventing free rotation of the tab (42) at the ends of the slot (44). A shaft (36) attached to the cap (20) and extends through the mounting member (24), first component (12) and second component (14). A curved retainer member (38) engages slot (18) and has sloping engaging surfaces (52, 54, 56) for guiding the retainer member (38) into and out of the slot (18) when the fastener (10) is twisted.
    Type: Grant
    Filed: August 29, 1990
    Date of Patent: June 23, 1992
    Assignee: Donaldson Company, Inc.
    Inventors: Donald F. Engel, Steven S. Gieseke
  • Patent number: 4974881
    Abstract: An air flow conduit system is presented for air flow communication between an air filter mechanism and an engine intake manifold. The conduit system comprises first, second and third substantially rigid conduit members. Engagement between conduit members is provided by a rib system on a narrow end of a conduit member being received within a broad end of a next adjacent conduit member. Sealing engagement occurs by an elastomeric seal member positioned between the ribs and an end of a conduit member within which the ribs are received. A preferred rib arrangement is provided, to insure a flexible, multi-point, seal system.
    Type: Grant
    Filed: April 20, 1989
    Date of Patent: December 4, 1990
    Assignee: Donaldson Company, Inc.
    Inventors: Donald F. Engel, Steven S. Gieseke
  • Patent number: 4856826
    Abstract: An air flow conduit system is presented for air flow communication between an air filter mechanism and an engine intake manifold. The conduit system comprises first, second and third substantially rigid conduit members. Engagement between conduit members is provided by means of a rib system on a narrow end of a conduit member being received within a broad end of a next adjacent conduit member. Sealing engagement occurs by means of an elastomeric seal member positioned between the ribs and an end of a conduit member within which the ribs are received. A preferred rib arrangement is provided, to insure a flexible, multi-point, seal system.
    Type: Grant
    Filed: April 27, 1988
    Date of Patent: August 15, 1989
    Assignee: Donaldson Company, Inc.
    Inventors: Donald F. Engel, Steven S. Gieseke
  • Patent number: 4720292
    Abstract: An air filter including a generally tubular filter element having an open air outlet end and a closed end is provided with a molded ring-like end cap of a soft elastomer material. A tubular air outlet member is mounted in the open end of the filter element with the end cap having a radially inwardly facing surface constructed so as to be compressed to sealingly engage the outlet member to block flow of contaminated air therebetween. A housing having an air inlet surrounds the filter element to provide an air distribution chamber for incoming contaminated air.
    Type: Grant
    Filed: July 14, 1986
    Date of Patent: January 19, 1988
    Assignee: Donaldson Company, Inc.
    Inventors: Donald F. Engel, Steven S. Gieseke
  • Patent number: 4699639
    Abstract: The present invention is directed to a unitary member formed to fit in the engine compartment of a vehicle and to function to both direct ram air toward the air cleaner and to eliminate moisture from that air. The unitary member includes an intemediate portion between inlet and outlet portions. The intermediate portion has a moisture elimination section with a drain opening.
    Type: Grant
    Filed: July 16, 1986
    Date of Patent: October 13, 1987
    Assignee: Donaldson Company, Inc.
    Inventors: Steven S. Gieseke, Donald F. Engel