Self-propelled apparatus for cleaning a water treatment tank
CA 2034862 C · Owner: Ford W. Hall Company · Inventors: Hall, Ford W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus (10) for cleaning algae and debris from a water treatment tank (12) includes a carriage (14) that is mounted for movement while extending over a clean water flow channel (C) of the treatment tank. A motor (18) drives the carriage (14) around the tank (12) while a guide (32, 50, 52) maintains the carriage in the proper position for cleaning. A series of brush assemblies (42 44, 46) are, connected to a frame (16) of the carriage (14). The brushes (42 44, 46) of these assemblies are adapted to engage and clean the weir (W) baffle (B), spillway (S) and clear water flow channel (C) of the tank (12) as the carriage (14) moves. Additionally a directional, controller (22) automatically …
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 January 24, 1991 and granted June 14, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 24, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 24, 2013.
- 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.