Patents by Inventor Alfred D. Carlson

Alfred D. Carlson 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: 4457036
    Abstract: In a combination sweeping, polishing and scrubbing floor maintenance machine, the present invention includes a debris hopper removably positioned in a frame secured to a portion of the machine. The debris hopper has a rearward opening facing a pair of substantially side-by-side disc tools, e.g. brushes. The brushes preferably rotate in the same rotational direction with one brush positioned slightly ahead of the other brush. Immediately in front of the forward edge of the leading brush is a conduit means secured to the hopper. Adjacent the conduit means and extending along the hopper opening is a flexible member. Both the flexible member and the conduit means serve as debris receiving means for directing swept debris upwardly into the debris hopper. Blade members may be provided forward of the debris receiving means and beneath the hopper to guide debris into a central area of the machine's path of travel.
    Type: Grant
    Filed: September 10, 1982
    Date of Patent: July 3, 1984
    Assignee: Tennant Company
    Inventors: Alfred D. Carlson, Donald J. Haub, Mark E. Snetting
  • Patent number: 4377017
    Abstract: A scrubber is disclosed including an applicator for applying a cleaning solution, a rotary brush for working such solution on the soiled surface and a pick up section for removing the cleaning solution and suspended soilage from the surface being scrubbed. The scrubber includes a dirty solution chamber and a clean solution chamber. A separator is provided between such chambers to separate the dirty water into a sludge portion which is returned to the dirty water chamber and a clean solution portion which is fed into the second chamber.
    Type: Grant
    Filed: November 19, 1979
    Date of Patent: March 22, 1983
    Assignee: Tennant Company
    Inventors: Ferdinand J. Herpers, Harley E. Kroll, Alfred D. Carlson, Paul D. Dodge
  • Patent number: 4295244
    Abstract: A scrubber is disclosed including an applicator for applying a cleaning solution, a rotary brush for working such solution on the soiled surface and a pick up section for removing the cleaning solution and suspended soilage from the surface being scrubbed. The scrubber includes a dirty solution chamber and a clean solution chamber. A separator is provided between such chambers to separate the dirty water into a sludge portion which is returned to the dirty water chamber and a clean solution portion which is fed into the second chamber.
    Type: Grant
    Filed: November 19, 1979
    Date of Patent: October 20, 1981
    Assignee: Tennant Company
    Inventors: Ferdinand J. Herpers, Harley E. Kroll, Alfred D. Carlson, Paul D. Dodge
  • Patent number: 4194263
    Abstract: A scrubber is disclosed including an applicator for applying a cleaning solution, a rotary brush for working such solution on the soiled surface and a pick up section for removing the cleaning solution and suspended soilage from the surface being scrubbed. The scrubber includes a dirty solution chamber and a clean solution chamber. A separator is provided between such chambers to separate the dirty water into a sludge portion which is returned to the dirty water chamber and a clean solution portion which is fed into the second chamber.
    Type: Grant
    Filed: June 19, 1978
    Date of Patent: March 25, 1980
    Assignee: Tennant Company
    Inventors: Ferdinand J. Herpers, Harley E. Kroll, Alfred D. Carlson, Paul D. Dodge
  • Patent number: D273621
    Type: Grant
    Filed: September 7, 1982
    Date of Patent: April 24, 1984
    Assignee: Tennant Company
    Inventors: Donald J. Haub, Alfred D. Carlson