Moving bed process for carbothermally synthesizing nonoxide ceramic powders
CA 2105776 C · Owner: Dunn, David A. · Inventors: Dunn, David A.; Eisman, Glenn A.; Adegbite, Valerie O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Carbothermally reduce a metal oxide to its corresponding metal nitride or metal carbide powder in a vertical gravity flow reactor (11) by adding precursor pellets containing the metal oxide a thermally decomposed binder mate-, rial and carbon or a source of carbon, directly to a heated reaction zone (31), within the reactor. The pellets form a pellet bed (19). The top of the bed (18), must be maintained within the heated reaction zone. The binder material is a blend of wheat and corn starches. The binder material thermally decomposes to a carbonaceous residue that functions both as an additional source of carbon and as a binder for the precursor pellets.
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 27, 1992 and granted April 23, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 27, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 27, 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.