Treatment of aqueous systems
CA 1211624 A · Owner: Dearborn Chemicals Limited · Inventors: Marshall, Alan; Greaves, Brian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of inhibiting corrosion in an aqueous system is described which comprises adding to the system at least one water soluble inorganic nitrite and at least one phosphonate which contains at least two acid groups which are carboxylic and phosphonic acid groups such that at least one acid group is a carboxylic acid group and at least one acid group is a phosphonic acid group, at least the said two acid groups being attached to carbon atoms, the concentration of phosphonate exceeding 5 ppm weight per volume and the weight ratio of nitrite to phosphonate being from 90:10 to 5:95.
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 September 23, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 23, 2003.
- 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.