Apparatus for and process of hydrolyzing and recycling polyisocyanate derivatives
CA 2279541 A1 · Owner: Naito, Takao · Inventors: Nagase, Yoshiyuki; Fukuzato, Ryuichi; Nishida, Satoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to an apparatus for hydrolyzing and recycling polyisocyanate derivatives having at least one isocyanato group and/or a group derived from an isocyanato group as target compounds to be hydrolyzed into raw materials or derivatives thereof for the target compounds, the apparatus including: a hydrolyzer for bringing only pressurized water in a liquid state at a temperature of 190 to 370°C into contact with the target compounds in the reactor to hydrolyze the target compound; anda post-processor for conducting post-processings such as dewatering, addition, distillation, separation and liquid, separation for a hydrolyzed reaction product discharged from the reactor.
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 February 4, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 4, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 4, 2020.
- 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.