Liquid filtration and incineration
CA 2103456 C · Owner: Rieber, Roy Silent · Inventors: Rieber, Roy Silent
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a filter aid or medium and a method of filtering liquid wastes having good filtration, good flow rates through the filter area, and heat value of the resulting filter cake containing the filtered solids of at least 5000 Btu per pound of filter aid. Rubber particles in a mesh size range of from about 30 mesh to 325 mesh alone , or with up to about 70 % silicious particles and, preferably a wetting agent is used for the filtration.
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 March 5, 1992 and granted November 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 5, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 5, 2014.
- 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.