Devices and methods for chemical reactive filtration
CA 2443892 A1 · Owner: Bause, Dan E. · Inventors: Unger, Peter Dale; Bause, Dan E.; Rohrbach, Ron Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A gas contaminant is filtered using fibers having internal cavities containing a chemically reactive oxidizing agent, an acid or base a coordinating agent, a complexing agent or a deliquescing agent. Where the contaminant is basic the reagent is preferably an oxidizing agent. Where the contaminant is acidic the reagent is preferably basic, and more preferably comprises a group 1 or group 2 metal cation. The reagent may also advantageously comprise a phosphate, chitosan, hypochlorite, borate carbonate, hydroxide, or oxide. , Where the contaminant is neutral the reagent is preferably an oxidizing agent, complexing agent, coordinating agent or deliquescing agent. The , reagent is …
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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 11, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 11, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 11, 2024.
- 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.