Process for preparing basic aluminum polychlorosulphates and their applications
CA 2199530 C · Owner: Dufour, Pascal · Inventors: Dufour, Pascal
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention involves a process for preparing basic aluminum polychlorosulphates. After basification the process consists of burning at a temperature between 60 and 95°C such that the burning time becomes shorter as the burning temperature is raised. The polychlorosulphates obtained using the process can be used in the paper industry and to treat drinking water and effluent.
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 March 7, 1997 and granted February 6, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 7, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 7, 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.