Treatment of water
CA 1182594 A · Owner: Ciba-Geigy Ag · Inventors: Thomas, Brian M.; Grade, Reinhardt
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for treating water comprises adding to the water (a) from 1 to 50 ppm of a phosphonium compound of the formula:, in which R represents C1-C6 alkyl groups which are unsubstituted or substituted by a cyano, hydroxy, esterified hydroxy or aryl group, R1 represents a C8-C18 alkyl group and X represents chlorine or bromine, and optionally (b) from 0.1 to 100 ppm of an anionic water treatment agent such as a scale or corrosion inhibiting agent.
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 February 12, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 12, 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.