Washing apparatus
CA 2089400 C · Owner: Jones And Attwood Limited · Inventors: Bache, John Cedric
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A washing apparatus for washing solid fractions such as screenings or grit derived from a sewage treatment plant and contaminated with faecal material such as faecal solids, the apparatus comprising a tank for receiving aqueous liquid and the contaminated solid fractions and, means for generating turbulence within said aqueous liquid to break-down the faecal contaminants. The invention also resides in a method of washing screenings.
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 February 12, 1993 and granted August 13, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 12, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 12, 2015.
- 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.