Coal depolymerization and hydroprocessing
CA 2100151 A1 · Owner: Maa, Peter S. · Inventors: Hsu, Chang S.; Singhal, Gopal H.; Maa, Peter S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for hydroprocessing coal to hydrocarbon oils wherein coal is depolymerized at low temperatures by contacting finely divided coal with a hard acid and soft base. The depolymerized coal is then hydroprocessed to hydrocarbon oils by forming a mixture with a coal conversion catalyst or precursor thereof and hydroprocessing the, mixture at temperatures of from 250 to 550°C and hydrogen partial pressures of from 2100 to 35000 kPa.
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 July 8, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 8, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 8, 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.