Woodworking latex adhesives with improved water, heat and creep resistance
CA 2123139 C · Owner: Kukkala, Pravin K. · Inventors: Kukkala, Pravin K.; Walker, John; Mudge, Paul R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Water resistant emulsions for woodworking adhesives may be prepared using an emulsion polymer, the polymer being prepared in the presence of 1 to 2.5% by weight of 88% hydrolyzed polyvinyl alcohol and 1 to 4% by weight of 95-99.5% (or above) hydrolyzed polyvinyl alcohol.
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 May 9, 1994 and granted January 27, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 9, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 9, 2016.
- 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.