Filter for removing solids from liquids
CA 2328873 A1 · Owner: Graham, William · Inventors: Graham, William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A filter (10) is disclosed which comprises a casing (18) having an inlet (42) for water to be purified. There is a first stage filter (12 16, 58) for , removing solids from the water. The water flows from the first stage filter to a second stage filter (66) for the purpose of subjecting the water to ultra filtration or micro filtration and/or to reverse osmosis.
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 15, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 15, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 15, 2021.
- 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.