Microwave activation of carbon
CA 2008242 C · Owner: Kondos, Peter D. · Inventors: Kondos, Peter D.; Macdonald, Raymond J.C.; Haque, Kazi E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is disclosed for the, regeneration of spent carbon which comprises the, steps of acid washing the spent carbon heating, the washed carbon with microwaves 915 MHz or 2450 MHz to a temperature in the range of about 650° to 850°C in a nitrogen atmosphere, cooling the carbon to a temperature in the range of about 150° to 200°C, and thereafter quenching the hot carbon in air or water. The spent carbon to be regenerated may be that originating from a CIP (carbon-in-pulp) process for gold recovery or any process for the removal of environmentally toxic materials from solutions or gases.
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 January 22, 1990 and granted April 4, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 22, 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.