Preparation of bismuth-modified spheroidal malachite
CA 1111056 A · Owner: E.I. Du Pont De Nemours And Company · Inventors: Fremont, Joseph M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Spheroidal agglomerates of malachite crystals are prepared by bringing together solutions of a cupric salt a bismuth, salt and an alkali metal carbonate or bicarbonate to form a mixture containing amorphous hydrated copper carbonate and then, holding the mixture, without agitation at a temperature of less, than about 55°C.
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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 October 20, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 20, 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.