Distillation column employing structured packing which reduces wall flow
CA 2221104 C · Owner: Lockett, Michael James · Inventors: Billingham, John Fredric; Lockett, Michael James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
17-, A heat and/or mass exchange structure which includes a shell having an outer vertical wall with an interior surface, a plurality of first corrugated packing sheets having an outer edge that is spaced away from the interior surface of the shell and a plurality, of second corrugated packing sheets positioned within the shell and sandwiched between a pair of the first corrugated packing sheets.
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 November 14, 1997 and granted January 16, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 14, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 14, 2019.
- 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.