Oxygen-permeable polymeric membranes
CA 2045966 A1 · Owner: Union Carbide Industrial Gases Technology Corporation · Inventors: Nishide, Hiroyuki; Tsuchida, Eishun; Kawakami, Hiroyoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Oxygen-permeable polymeric membranes to be used in processes for producing oxygen- or nitrogen-enriched air for industrial, medical, and other applications are characterized by a complex comprising (a) a transition metal (II) ion (b) a, ligand comprising a meso-tris(.alpha..alpha..alpha.-o-substituted-amidophenyl)mono-(.beta.-o-substituted amidophenyl)porphyrinato said metal ion, and porphyrin being of the formula (I) (I), in which M stands for a transition metal (II) R's are a, substituent each, being acetyl acryl, methacryl, or pival, and, (c) an aromatic amine polymer.
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 June 28, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 28, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 28, 2013.
- 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.