Method for the regenerative treatment of mainly clay-bound foundry old sand
CA 2030568 C · Owner: Wilhelm, Ludwig · Inventors: Wilhelm, Ludwig; Satmer, Franz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for regenerating foundry old sand is proposed, by which method combined impact and shearing stress of the sand grains occurs with simultaneous dust removal. The dust removed by suction contains nonburned bentonite and carbon parts which can be re-used in the same way as the regenerated material or core sand. Environmental pollution and quantities for dumping are drastically reduced.
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 22, 1990 and granted October 10, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 22, 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.