Porous anodic aluminium oxide membranes
CA 2000056 A1 · Owner: Furneaux, Robin C. · Inventors: Furneaux, Robin C.; Rigby, William R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An asymmetric anodic aluminium oxide membrane has two major surfaces with a system of larger pores extending in from one surface and communicating with a system of smaller pores extending in a distance s from the other surface. The membrane is characterized by having a thickened small pore region so that the distance s is greater than 1 micron. Thickening the small pore region is effected by interrupting the voltage reduction procedure used to detach the membrane from its metal substrate. When used as filters for e.g. phage or mycoplasma, the membranes are more reliably defect-free.
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.