Method for the alteration of siliceous materials from bayer process liquids
CA 2098442 C · Owner: Nalco Chemical Company · Inventors: Dimas, Peter A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Siliceous materials produced by thermally treating Bayer process liquors are obtained in modified form when produced in the presence of ammonium aromatic amine; and amine compounds, or compounds bearing ammonium aromatic amine or amine moieties, such as N-propylamine pyridine and, tetramethylammonium hydroxide. These modified siliceous materials possess morphologies which confer upon them a reduced tendency to deposit on surfaces throughout the process.
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 June 15, 1993 and granted December 23, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 15, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 15, 2015.
- 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.