Process for the preparation of monomeric tetramethoxymethylglycoluril
CA 2072045 C · Owner: Boldizar, Leslie · Inventors: Thomas, Daniel W.; Boldizar, Leslie; Luciw, Fred W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Described is an improved process for the preparation of fully methylolated, substantially fully etherified, and substantially monomeric tetramethoxymethylglycoluril useful as a crosslinking agent for powder coatings. The improved process adds after the conventional steps of methylolation and etherification the new steps of acidic distillation followed by an additional etherification.
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 June 23, 1992 and granted September 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 23, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 23, 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.