Patents by Inventor Bob Schaefer

Bob Schaefer 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).

  • Material spreader for a heavy duty vehicle
    Patent number: 10526754
    Abstract: A material spreader for a heavy duty vehicle is provided having a hopper capable of carrying and distributing a particulate material, a longitudinally extending conveyor to move material within the hopper, a pivotably attached discharge chute and optionally, one or more liquid storage tanks secured to the exterior of the hopper by a securement system comprise a series of one or more straps connected on each end to a c-shaped cross member affixed to the vehicle or hopper body.
    Type: Grant
    Filed: March 15, 2018
    Date of Patent: January 7, 2020
    Assignee: Swenson Spreader, LLC
    Inventors: Troy Fox, Tom Rasmussen, Bill Hintzsche, Bob Schaefer
  • MATERIAL SPREADER FOR A VEHICLE
    Publication number: 20180298567
    Abstract: An apparatus for depositing associated materials, including but not limited to salt or sand, onto a surface includes a material spreader hopper, a conveyor to convey associated material in the hopper toward an opening at one end of the hopper; a feed gate adapted to selectively close the opening, an extension and a spreader adapted as described herein, to mount to the extension.
    Type: Application
    Filed: March 15, 2018
    Publication date: October 18, 2018
    Inventors: Christopher Norkus, Greg Gann, Bill Hintzsche, Bob Schaefer
  • MATERIAL SPREADER FOR A HEAVY DUTY VEHICLE
    Publication number: 20180298568
    Abstract: A material spreader for a heavy duty vehicle is provided having a hopper capable of carrying and distributing a particulate material, a longitudinally extending conveyor to move material within the hopper, a pivotably attached discharge chute and optionally, one or more liquid storage tanks secured to the exterior of the hopper by a securement system comprise a series of one or more straps connected on each end to a c-shaped cross member affixed to the vehicle or hopper body.
    Type: Application
    Filed: March 15, 2018
    Publication date: October 18, 2018
    Inventors: Troy Fox, Tom Rassmussen, Bill Hintzsche, Bob Schaefer
  • Electric interlock for spreader
    Patent number: 8505838
    Abstract: A material spreader may include an electric interlock mechanism that is adjustable between: (1) a first condition where an electric supply line can supply electricity to operate a material transfer member and a door cannot be moved into an open position; and, (2) a second condition where the electric supply line cannot supply electricity to operate the material transfer member and the door can be moved into an open position.
    Type: Grant
    Filed: December 27, 2010
    Date of Patent: August 13, 2013
    Assignee: Louis Berkman Company
    Inventors: Bob Schaefer, Eric Larsen, Roland Hagemeyer
  • ELECTRIC INTERLOCK FOR SPREADER
    Publication number: 20120160929
    Abstract: A material spreader may include an electric interlock mechanism that is adjustable between: (1) a first condition where an electric supply line can supply electricity to operate a material transfer member and a door cannot be moved into an open position; and, (2) a second condition where the electric supply line cannot supply electricity to operate the material transfer member and the door can be moved into an open position.
    Type: Application
    Filed: December 27, 2010
    Publication date: June 28, 2012
    Inventors: Bob Schaefer, Eric Larsen, Roland Hagemeyer