Preventing crevice corrosion of titanium surfaces
CA 2016246 C · Owner: Dow Global Technologies Inc. · Inventors: Beaver, Richard N.; Burney, Harry S. Jr.; Mcmichael, James W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This discloses protection against crevice corrosion of titanium surfaces, such as cells piping, and equipment used in a chlor-alkali membrane process by employing in the areas in which titanium is subject to crevice corrosion a coating or film cast from a "paint" dispersion containing a fluorocarbon binder material, e.g. perfluorosulfonic acid polymer a, platinum group metal oxide, e.g. ruthenium oxide and, optionally a valve metal oxide e.g. titanium oxide; and a carrier agent, e.g. ethanol and water mixture.
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 8, 1990 and granted September 29, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 8, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 8, 2012.
- 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.