Method regulating the level of a mixture of flowable material made up of at least two components in a container having an outlet
CA 2015178 C · Owner: Windmoller & Holscher · Inventors: Saatkamp, Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of regulation of the charging of the feed hopper of an extruder with plastic granules where it is, necessary to supply the material in an amount such that the average level in the container or hopper remains constant with the least possible fluctuation despite the continual and as a rule, uninterrupted removal of material from the container in the case of which, despite uninterrupted removal of material, the average level in the hopper or other container is maintained and is subject to the least possible fluctuation.
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 23, 1990 and granted February 4, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 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.