Synthetic spinels and processes for making them
CA 2104233 C · Owner: Demmel, Edward J. · Inventors: Demmel, Edward J.; Magnabosco, Louis M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Spinels can be synthesized by uniformly dispersing predetermined quantities of ingredient compounds whose particles have sizes no greater than about 5 nanometers in a liquid medium arresting the ingredient compounds in a solid matrix by spray drying said liquid medium and then calcining the resulting particles to form a solid solution of oxides of said compounds in a crystalline lattice which is substantially free of undesired complex compounds of the ingredient compounds.
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 February 21, 1992 and granted September 30, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 21, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 21, 2014.
- 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.