Cleaning of equipment used in a liquid phase oxidation process
CA 2031874 C · Owner: Bowman, David Frederick · Inventors: Bowman, David Frederick
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Composition for cleaning equipment used in a liquid phase oxidation process comprising an aqueous solution of between 3 and 30 %mass of a salt of sulphurous acid between 0.5 and 30 %mass of a chelating agent and between 0.05 and 5 %mass of a cationic surfactant.
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 December 10, 1990 and granted October 10, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 10, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 10, 2012.
- 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.