Gas barrier coating and coated elastomeric toy balloons
CA 2134107 C · Owner: Hi-Float Co. Inc. · Inventors: Sinclair, Harold K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The floating life of toy elastomeric balloons inflated with helium is greatly increased through modifying polyvinyl alcohol coatings from the prior art by removing the glycerine plasticizer from the coating and adding an extender comprised of a saccharide, such as dextrose, at levels up to four times the weight of polyvinyl alcohol. The improved coatings of the present invention typically give double the floating life of the prior art coatings under a wide range of humidifies.
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 March 12, 1993 and granted February 5, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 12, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 2015.
- 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.