Chemical feeder
CA 2188461 C · Owner: Axiall Ohio, Inc. · Inventors: Dooley, Gerard F.; Wiedrich, Charles R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Described is a chemical feeder (E;) having a housing (10) with a base member (12) and upwardly extending side walls (14) that define a cavity (8) for containing solid chemical material, e.g. calcium hypochlorite. A hollow chamber (20) is located within the cavity and seated on the base member (12). An annular collection zone (48) is created by the side walls (18) of the chamber (20) spaced apart from the side walls (14) of the housing (10). There is an inlet (40) for supplying dissolving liquid into the hollow chamber (20) and up through a grid (22) and an outlet (34) for removing a liquid solution of the dissolved chemical material from the collection zone (4).
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 April 20, 1995 and granted August 24, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 20, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 20, 2017.
- 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.