Filter for removing fine particles
CA 2284964 A1 · Owner: Liu, Paul K.T. · Inventors: Latimer, Glen E. Jr.; Liu, Paul K.T.; Fatheringham, Harold L. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A filter for removing particles from a feed liquid. The filter includes a filtration material having a metal oxide composition selected to provide the material with an affinity for the particles of the feed liquid. The affinity of the material is dependant upon a pH of the feed liquid.
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 September 29, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 29, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 29, 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.