Window-pane cleaning device
CA 2017404 C · Owner: Nihon Biso Co. Ltd. · Inventors: Mimura, Noritaka
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A window-pane cleaning device for cleaning windowpanes of a building is provided in a cleaning unit which is moved along a window of the building. The device includes a squeezee for cleaning a window-pane an, approaching and retraction servo device for moving the squeezee toward and away from the surface of the windowpane, an inclination angle adjusting servo device for adjusting the inclination angle of the squeezee sensors for detecting the position and pressing force of the squeezee, and a control device responsive to detection outputs of the sensors for controlling the pressing force and inclination angle of the squeezee to predetermined values respectively at starting of cleaning, …
Read the whole patent
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 May 23, 1990 and granted July 19, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 23, 2012.
- 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.