Surface treating agents for metal work
CA 2026684 A1 · Owner: Sanwa Laboratory Ltd. · Inventors: Kawai, Hideyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Surface treating agents for metal work containing at least one benzimidazole compound represented by the following formula (I):, (I), in which R1 independently represents a substituted or unsubstituted alkyl group of 1 to 6 carbon atoms m is, an integer of 0 to 2, and R2 independently represents a hydrogen atom, a substituted or unsubstituted alkyl group of 1 to 17 carbon atoms or an aryl group of the formula:, wherein R3 independently represents a substituted or unsubstituted alkyl group of 1 to 6 carbon atoms and, n is an integer of 0 to 3. These surface treating agents are particularly useful as a preflux in the production of printed circuit boards.
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 2, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 2, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 2, 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.