Patents by Inventor Mark Zellefrow

Mark Zellefrow 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: 7610646
    Abstract: A towable lawn sweeper comprising a housing, a hitch assembly, a sweeper assembly and a sweeper height adjustment assembly. The hitch assembly is rigidly coupled to the housing and includes a clevis comprising a plurality of connector members forming a plurality of connection positions to adjustably couple the lawn sweeper to a tow vehicle. The sweeper assembly is rotatably coupled to the housing and includes at least one brush that is attached to an axle of the sweeper assembly in a spiral pattern about a longitudinal axis of the axle. The sweeper height adjustment assembly is pivotably coupled to the housing and includes a height adjustment bar pivotally mounted to the housing, a lever extending from the height adjustment bar generally perpendicular, a height retention member pivotally connected to the hitch assembly, and a fastener to releasably secure the lever to the height retention member.
    Type: Grant
    Filed: April 10, 2006
    Date of Patent: November 3, 2009
    Assignee: Ohio Steel Industries, Inc.
    Inventors: Mark Zellefrow, Joseph Chattin, Richard Biggs
  • Publication number: 20090121203
    Abstract: A lifting device for a lawn tractor. An angle member has first and second generally planar portions, the second planar portion being oriented generally perpendicularly and joined to the first planar portion. A pair of wheels are rotatably attached to opposing ends of the angle member. A handle extends from the first planar portion of the angle member. A foot brace is attached to the handle and is oriented generally perpendicularly thereto; A pair of spaced-apart lift members extend from the second planar portion of the angle member. An elongated safety brace is configured to detachably couple to the foot brace. The safety brace is positionable to extend beneath the angle member while coupled to the foot brace and while the lifting device is in a service position, thereby resisting movement of the lift from the service position.
    Type: Application
    Filed: November 7, 2008
    Publication date: May 14, 2009
    Applicant: OHIO STEEL INDUSTRIES, INC.
    Inventors: Thomas P. Martini, Mark Zellefrow, Rodger Hays, Ken Hoffman, Fred Feeney, Mike Podrosky
  • Publication number: 20070164526
    Abstract: A lawn and garden cart has a frame and an axle attached to the frame. A pair of wheels are attached to the axle, each wheel being rotatably attached to an opposing end of the axle. A longitudinal tow bar is attached to the frame at a first end, the tow bar including a connector at a second distal end. The cart further includes a container having a base, a plurality of generally vertical sidewalls and an angled rear wall, the container being pivotally attached to the frame and releasably coupled to the tow bar.
    Type: Application
    Filed: January 10, 2007
    Publication date: July 19, 2007
    Applicant: OHIO STEEL INDUSTRIES, INC.
    Inventors: THOMAS MARTINI, RODGER HAYS, MARK ZELLEFROW, JASON MOORE, KEN HOFFMAN, FREDERICK FEENEY, KEVIN CAHALAN, RICHARD BIGGS, TOM HAYS, HARLAN PEDEN, DALE BAUMAN, SEAN SVENDSEN
  • Publication number: 20060230557
    Abstract: A towable lawn sweeper comprising a housing, a hitch assembly, a sweeper assembly and a sweeper height adjustment assembly. The hitch assembly is rigidly coupled to the housing and includes a clevis comprising a plurality of connector members forming a plurality of connection positions to adjustably couple the lawn sweeper to a tow vehicle. The sweeper assembly is rotatably coupled to the housing and includes at least one brush that is attached to an axle of the sweeper assembly in a spiral pattern about a longitudinal axis of the axle. The sweeper height adjustment assembly is pivotably coupled to the housing and includes a height adjustment bar pivotally mounted to the housing, a lever extending from the height adjustment bar generally perpendicular, a height retention member pivotally connected to the hitch assembly, and a fastener to releasably secure the lever to the height retention member.
    Type: Application
    Filed: April 10, 2006
    Publication date: October 19, 2006
    Inventors: Mark Zellefrow, Joseph Chattin, Richard Biggs
  • Publication number: 20030145799
    Abstract: An animal enclosure system is disclosed utilizing a coated metal wire grid mounted within a frame formed of horizontal and vertical support members. The end of each wire on the wire grid has a captive termination that allows the wire grid to be installed into an opening, hole, or channel of the support members. The wire grid may also incorporate a hinge area formed by dividing the horizontal wires into two portions and wrapping the inner terminating points around a particular perpendicular vertical wire near the mid-point of the body of the wire grid. The hinge allows the wire grid to be folded, facilitating easier handling, storage and transport of the enclosure in its disassembled state. When the wire grid is assembled with the support members, along with corner pieces, it forms a single panel of the animal enclosure.
    Type: Application
    Filed: January 13, 2003
    Publication date: August 7, 2003
    Inventors: Rodger Hays, Elmer J. Chatin, Mark A. Zellefrow
  • Patent number: D473691
    Type: Grant
    Filed: March 1, 2001
    Date of Patent: April 22, 2003
    Assignee: Ohio Steel Industries, Inc.
    Inventors: Paul Kolada, Rodger Hays, Mark Zellefrow