Stable liquid biuret modified and biuret allophanate modified diphenylmethane diisocyanates, prepolymers thereof, and processes for their preparation
CA 2474313 C · Owner: Slack, William E. · Inventors: Adkins, Rick L.; Slack, William E.; Kemp, Hersel T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to stable liquid modified diphenylmethane diisocyanates which comprise a secondary amine based biuret modified diphenylmethane diisocyanate having an NCO group content of about 12 to about 30% by weight. The present invention also relates to stable liquid biuret allophanate modified MDIs to stable liquid prepolymers of biuret modified MDIs to stable liquid prepolymers of biuret allophanate modified MDIs and to processes for the preparation of these compositions.
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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 14, 2004 and granted May 8, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 14, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 14, 2026.
- 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.