Method and apparatus for adjusting a preselected sweeping surface width of a revolving roll-type brush
CA 2004772 C · Owner: Leers, Konrad · Inventors: Leers, Konrad
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus is provided for adjusting a preselected sweeping area width of a revolving roll-type brush rotatable around an axis for the cleaning of roadways, airport runways and the like wherein the, spacing between the axis of the revolving brush and the surface to be cleaned is altered for adjusting the sweeping surface, or area swept, and wherein for the dimen-, sioning of the nominal spacing the brush diameter is, detected by means of a sensor and the spacing of the brush axis from the surface to be cleaned is adjusted according to the diameter of the revolving brush. The actual spacing between the brush axis and the surface to be cleaned is measured and when there are …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed December 6, 1989 and granted November 29, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 6, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 6, 2011.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.