Porous membranes suitable for separation devices and other uses
CA 2057930 C · Owner: Rosenfeld, Aron Marcus · Inventors: Thomas, Michael Patrick; Rosenfeld, Aron Marcus; Furneaux, Robin Christopher
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Porous membranes incorporating porous anodic films are disclosed. The membranes, which may be used as filters gaseous, diffusion media, dialysis membranes etc, are produced by porous anodizing aluminum or other porous anodizable moral creat-, ing a weakened stratum in the resulting porous anodic film (e.g by a voltage , reduction procedure during the anodizing step) at-, taching a support to the porous anodic film and separating the film along the weakened stratum. If the support is perforated the resulting structure is suitable as a separation device. If imperforate the , support can subsequently be perforated if required, or re-, placed by a perforate support or supporting structure. …
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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 September 28, 1990 and granted November 27, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 28, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 28, 2012.
- 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.