Electrostatic separation device for sorting triboelectrically charged mixtures
CA 2221386 C · Owner: Stahl, Ingo · Inventors: Geisler, Iring; Stahl, Ingo; Knauer, Hans-Jurgen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to an electrostatic separating device in the form of a free-fall separator for sorting triboelectrically charged mixtures of materials.A separate voltage source (9a 9b,) is attached in such a manner to each of the electrodes forming a pair of electrodes that one of these sources supplies a positive voltage in relation to the earth potential and the other supplies a negative voltage in relation to the earth potential and as a result the potential difference relative to earth is zero in the middle of the separator.
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 November 17, 1997 and granted April 3, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 17, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 17, 2019.
- 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.