Method of removing chloride ion or a compound thereof from a surface contaminated therewith
CA 2189345 C · Owner: Sjunnesson Sales Acc · Inventors: Colahan, Jerry J.; Johnson, James R.; Eden, Todd R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is directed to a method of removing chloride ion a compound thereof, or flash rust (metal oxide) from a surface contaminated with chloride. The method comprises the steps of providing a surface contaminated with chloride ion a compound thereof, or flash rust, and applying a dilute aqueous solution containing an active agent selected from the group consisting of an amine anionic, surfactant, organic carboxylic acid organic sulfonic acid, and mixtures thereof to the surface in an amount sufficient to remove substantially all of the chloride ion, compound thereof or flash rust from the surface.
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 May 5, 1995 and granted July 11, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 5, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 5, 2017.
- 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.