Process for removal of residual organic matter and color from purified phosphoric acid
CA 1198575 A · Owner: Mobil Oil Corporation · Inventors: Grotyohann, Richard G.; Johnston, Byron E.; Schlinger, Robin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention provides a process for removal of residual organic matter and color from purified wet process phosphoric acid that comprises contacting the purified phosphoric acid with hydrogen peroxide at a temperature between 100°C. and 150°C. for between l/4 hour and 4 hours, and using a weight ratio of hydrogen peroxide to phosphoric acid between 0.001 and 0.05.
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
- Granted December 31, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 31, 2002.
- 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.