Method for producing activated alumina catalyst
CA 2177875 C · Owner: Ahghar, Massoud · Inventors: Rendall, John S.; Lane, Stephen J.; Ahghar, Massoud
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of making activated alumina, including the steps of dissolving a double salt of aluminum in a solution of pure water at 85°C recrystalizing the double salt at a pressure about 250 psi and temperature ranging from 200°C to 250°C, precipitating out the purified basic double salt, drying the precipitated double salt to drive off water and roasting it at 850°C to 950°C to drive off the sulfate, washing to remove the potassium sulfate and then drying the remaining alumina to yield activated alumina for use as a high-grade catalyst.
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 May 31, 1996 and granted January 7, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 31, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 31, 2018.
- 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.