Mixer/aerator for waste water
CA 2001509 C · Owner: Hector, Haegeman J. · Inventors: Hector, Haegeman J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus designed to mix and/or aerate waste water by floating on the surface of the water comprising a motor (2) having a shaft (3) oriented downwards and driving a propeller (4), a guide tube (5), a water-deflecting device (6) and at least two floats, an upper float (9) and a lower float (10) mounted apart one above the other and arranged concentrically relative to the axis of the motor (2) which allow the apparatus (1) to be positioned between two limiting levels relative to the surface of the water :, - a lower level where only the upper float (9) is situated on the surface of the water and in which the apparatus is suitable for use as a mixer and - a upper level where only the lower …
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 October 25, 1989 and granted December 9, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 25, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 25, 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.