Water soluble crayon compositions
CA 2032632 A1 · Owner: Union Carbide Chemicals And Plastics Company Inc. · Inventors: Olson, James D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, This invention relates to water soluble crayon compositions which are comprised of (i) one or more water soluble alkoxylation products and (ii) a coloring agent, and to crayons produced therefrom. This invention also relates to processes for the production of water soluble crayon compositions and for the manufacture of crayons. D-16365
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 December 18, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 18, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 18, 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.