Non-chrome final rinse for phosphated metal
CA 2049892 C · Owner: Ppg Industries Ohio, Inc. · Inventors: Bergeron, Floyd Leon; Mcmillen, Mark W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This application relates to a water-based passivating composition comprising:, (a) an amino compound which is selected from the group consisting of an amino acid and salts thereof and an amino alcohol and salt thereof, and, (b) a metal compound selected from a group IIIB transition metal compound, a group IVB transition metal compound and a rare earth metal compound.
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 August 26, 1991 and granted April 29, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 26, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 26, 2013.
- 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.