Liquid polymer composition including ammonium salt of phosphoric or phosphorous acid inhibiting corrosion of metals in contact with salt water and method therefor
CA 2186648 C · Owner: Lockheed Martin Corporation · Inventors: Sharaby, Ahmed; Miller, Robert N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Applying to metal surfaces a liquid polymer composition containing a polysulfide, a polyurethane a, polythioether, or a polyether, as well as a water soluble ammonium salt of phosphoric acid or ortho- or hypophosphorous acid, thereby inhibiting corrosion when exposed to aqueous salt solutions.
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 October 22, 1990 and granted April 2, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 22, 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.