Improvements in window cleaning
CA 2136756 C · Owner: Allen, Charles · Inventors: Farmdale, Peter Johnson; Farsi, Mohammed; Allen, Charles
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cleaning device for cleaning windows comprises an elongate wiper element (C) which is robotically controlled to move across the surface of the window to apply and remove cleaning fluid therefrom. The robotic control can be so arranged that the movement of the wiper element corresponds to that which it would follow if used manually by a skilled window cleaner.
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 26, 1993 and granted December 9, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 26, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 26, 2015.
- 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.