Method and apparatus for remediating contaminated material
CA 2196284 C · Owner: Lashmett, H. W. · Inventors: Lashmett, H. W.; Karpik, Merideth L.; Herzog, Larry R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The apparatus (10) of the present invention includes a tank (12) containing a cleaning fluid (112) having microorganisms therein. The material to be cleaned (92) is placed within the tank (12) and the microorganisms separate the contaminates from the material to be cleaned (92). The cleaning fluid (112) is recirculated continuously through the cleaning tank (12) and the contaminates are drawn off of the fluid within the container (13) as the contaminates rise to and float upon the top surface of the fluid (see 114) within the container (13).
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 June 29, 1995 and granted December 28, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 29, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 29, 2017.
- 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.