Oxygen removal from partially purified nitrogen
CA 2103225 C · Owner: Praxair Technology, Inc. · Inventors: De Wilde, Robert M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The residual oxygen in a partially purified nitrogen stream, as from a membrane or PSA unit is, reacted with a hydrocarbon to provide a protective gas atmosphere of nitrogen, carbon monoxide and hydrogen either in an externally heated reactor or within the furnace in which the protective gas atmosphere is to be employed.
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 November 16, 1993 and granted January 20, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 16, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 16, 2015.
- 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.