Formation of composite materials with expandable matter
CA 2406208 A1 · Owner: Johnston, Arthur F. · Inventors: Hughes, Kenneth D.; Williams, Frank A.; Johnston, Arthur F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for generating composite materials and devices from these materials for the filtration, purification, and processing of fluids water, or other , solutions containing microbiological or chemical contaminants such as fluids , containing cysts, bacteria and/or viruses and inorganic and/or organic contaminants, where the fluid is passed through or over a composite purification material composed of non-expandable and expandable matter that swell through the absorption of fluid.
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, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 20, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 20, 2023.
- 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.