Iminodiacetonitrile mirror back coating corrosion inhibitor
CA 2281771 A1 · Owner: Sanford, Timothy J. · Inventors: Sanford, Timothy J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A lead-free composition capable of being applied as a film and hardening to form a protective layer on the back of a mirror comprises a fluid organic resin and a corrosion inhibitior selected from a compound represented by formula (I) wherein the individual radicals R1 R2, R3 and R4 can be identical , or different and are each hydrogen an aliphatic, cycloaliphatic, araliphatic or aromatic radical, and can be substituted or unsubstituted; A is hydrogen or CZ-CR5R6CN; X, Y and Z are independently selected from 0-5; and R5 and R6 are as defined for R1, R2, R3 and R4 above. A preferred additive is iminodiacetonitrile wherein A is hydrogen; R1 R2, R3 and R4 are each , hydrogen; and X and …
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 February 3, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 3, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 3, 2020.
- 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.