Treating porous anodic aluminium oxide membrane
CA 2000045 A1 · Owner: Thornton, Martin C. · Inventors: Thornton, Martin C.; Mcalpine, Eoghan; Landham, Rowena R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns methods of improving the chemical resistance of porous anodic aluminium oxide membranes such as are used for filters. The membranes may simply be heated to temperatures above 650°C typically 850 - 1250°C. Or a sol or solution of a metal compound in a volatile liquid may be applied to the membrane and decomposed to form a metal oxide coating on interior and exterior surfaces thereof the, coated membrane being heated to at least 100°C preferably 250 - 650°C. Preferred coatings are oxides of Ta, Nb, Ti and Zr.
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 October 2, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 2, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 2, 2011.
- 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.