Method of cleaning debris
CA 2015089 C · Owner: B.C.C. Becker Consultants (Canada) Inc. · Inventors: Dumont, Eugen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Debris, such as soil from a coking plant is cleaned by, simultaneously separating heavy metals and oils from the debris. The debris is primarily an inert substance. Acetic anhydride is employed which is mixed with the debris, so as to remove any moisture from it. After the acetic anhydride has been added aqueous acetic acid is, distilled off from the mixture. The remaining distillant is then filtered to remove the heavy metals and oils from the debris leaving, clean debris and separated heavy metals and oils.
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 April 20, 1990 and granted February 17, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 20, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 20, 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.