Alloying process
CA 2047806 C · Owner: Kowalczyk, Lawrence E. · Inventors: Hordon, Monroe J.; Kowalczyk, Lawrence E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is an alloying process which comprises in the order, stated (1) heating in a reaction vessel a mixture of selenium and tellurium from ambient temperature to from about 270°C to about 330°C while maintaining the mixture in a quiescent state; (2) maintaining the mixture at from about 270°C to about 330°C until the entire mixture has reached substantial equilibrium with respect to temperature while maintaining the mixture in a quiescent state; (3) subsequently heating the mixture from the range of from about 270°C to about 330°C to the range of from about 500°C to about 580°C while maintaining the mixture in a quiescent state; (4) maintaining the mixture at from about 500°C to about …
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 July 24, 1991 and granted October 6, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 24, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 24, 2013.
- 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.