Process for producing agglomerates from dusts
CA 2177814 C · Owner: Clegg, Robert Louis · Inventors: Carruthers, Andrew Nicolson; Boulanger, Claude; Clegg, Robert Louis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing, strong, essentially dust-free agglomerates from dust created by, an industrial operation carried out, for example, on an ore or, mineral e.g, during the thermal, conversion of a material containing predominantly gibbsite, to sub-alpha alumina by a multistage thermal process having, at least one intermediate stage. The process comprises, grinding particles of binder material containing undercalcined, alumina to a median particle size of less than 30 x 10 -4 cm, (30 microns) and to a specific surface area in the range of , 90-300 m2/g; combining about 1-4 parts by weight of the dust with, one part by weight of the ground binder material to form , combined solids; …
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 December 12, 1994 and granted July 13, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 12, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 12, 2016.
- 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.