Process for treating zircon-containing foundry sand
CA 1101632 A · Owner: E. I. Du Pont De Nemours And Company · Inventors: Bushey, William R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
E.I. du Pont de Nemours & Company, (Bushey William Raymond), ABSTRACT, Process for treating zircon-containing foundry sand by intimately contacting the sand with an aqueous solution of an alkali metal silicate and isolating the sand from the solution. The treated sand is useful as the sand component of resin molds and cores.
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
- Granted May 26, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 26, 1998.
- 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.