Patents Represented by Attorney John C. La Prade

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  • Ladder lift apparatus
    Patent number: 4770273
    Abstract: A lifting apparatus usable to lift heavy loads from the ground to a roof surface including a horizontally positioned, shoulder mounted lifting bar or beam with a winch means, fastened to the bar or beam where one end of the lifting bar or beam is pivotally connected to a vertically positioned ladder or extension ladder, with means to allow pivotal rotation of the upper end of the ladder toward the roof to deposit the load on the roof or into a window of a multi-story building.
    Type: Grant
    Filed: December 7, 1987
    Date of Patent: September 13, 1988
    Assignee: McCrane Co.
    Inventors: William H. McMakin, Mark R. McMakin, Glen R. McMakin
  • Liquid proportioning device
    Patent number: 4068681
    Abstract: The Improved Liquid Proportioning Device of this invention comprises a combination of all the features of the liquid proportioning device set forth in Applicant's prior U.S. Pat. No. 2,856,234 with the addition of a closure device including air vent means equipped with a float valve. The air vent may, in one embodiment work in combination with a flow-diverting conduit, where closure means are provided for the air vent and the flow-diverting conduit.
    Type: Grant
    Filed: October 10, 1975
    Date of Patent: January 17, 1978
    Assignee: Hydro Mix, Inc.
    Inventors: Hugh Noel McNair, Stuart William Olson