Aqueous-based coating compositions comprising water-insoluble resin
CA 2054550 A1 · Owner: W.C. Richards Company · Inventors: Lo, Salvador R.; Gay, Arthur S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Aqueous-based coating compositions having about 10 to about 60 parts by weight of a coating-grade water-insoluble resin; an effective amount of a curing agent for the resin; about 10 to 30 parts by weight of at least one watermiscible solvent having a Hansen solubility parameter greater than 9.4 and a Hansen hydrogen bonding solubility parameter greater than 4.5, and water wherein the ratio by volume of the water to the solvent is at least 0.1. The compositions are useful as primers and coatings in applications requiring low volatile organic chemicals.
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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 30, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 30, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 30, 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.