Method of cleaning a metal surface
CA 2417580 A1 · Owner: Tippett, Roger J. A. · Inventors: Meskers, Donald A. Jr.; Tippett, Roger J. A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Methods and compositions for controlling corrosion of high strength steels in the presence of a cleaning solution for removing iron oxide scale from metal surfaces. A benzotriazole or benzimidazole compound is added to a combination of ethoxylated mercaptan and/or oxidized ethoxylated mercaptan and 1hydroxyethylidene-1,1-diphosphonic acid. The composition is added to an aqueous system, such as a steam generating system to remove scale from the , metal surfaces.
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 July 10, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 10, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 10, 2023.
- 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.