Process for purifying industrial gases and industrial flue gases
CA 1258565 A · Owner: Degussa Aktiengesellschaft · Inventors: Knorre, Helmut; Fischer, Joachim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In the purification of cyanide-containing gas wash water with formaldehyde the accurate dosage of formaldehyde constitutes a problem particularly in the case of intensely varying cyanide contents. By continuous potentiometric measurement in a secondary flow which is adjusted to a pH value of 7 to 10 while the pH value of the main flow remains unchanged the formaldehyde dosage can be reliably adapted to the cyanide contents at any given time.
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 August 22, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 22, 2006.
- 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.