Water-based scratch-off ink for gaming forms
CA 2074589 C · Owner: Gtech Corporation · Inventors: Carrick, Bryan W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A scratch-off coating composition and method for application of the coating to lottery forms, and the like, are provided herein. The scratch-off coating employs a, water-based dispersion of acrylic resin at equal proportions of resin and , water by, weight. The dispersion is adjusted to a pH greater than 7.0 and a surfactant , is, preferably added as a wetting defoaming and/or dispersing agent. A pigment of metallic, particles, e.g. aluminum paste is added together with a powdered filler, e.g. calcium carbonate, at 5 % to 25 % by weight of the coating composition. The composition can, be applied in successive layers including outer layers of relatively higher proportions of, resin for …
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 July 24, 1992 and granted September 16, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 24, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 24, 2014.
- 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.