Nitric acid production and recycle
CA 2238304 C · Owner: Drinkard, William F. Jr. · Inventors: Drinkard, William F. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved process for either the manufacturing of nitric acid recycling , nitric acid, or recovering of nitric acid comprising the, steps of: providing a source of NO x; reacting one mole NO from the source of NO x with one mole of HNO3 in the presence of NO2- to produce a resulting product; and reacting the resulting product with one mole of O2 and one mole of H2O to produce two moles of nitric acid.
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 27, 1996 and granted March 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 27, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 27, 2018.
- 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.