Coal tar and hydrocarbon mixture pitch production using a high efficiency evaporative distillation process
CA 2357237 A1 · Owner: Koppers Industries Of Delaware, Inc. · Inventors: Mchenry, E. Ronald; Saver, William E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Described are methods that utilize high efficiency evaporative distillation to make a, high softening point coal tar pitch a quinoline insoluble-free and ash-free coal tar pitch, having a desired softening point and a mesophase coal tar pitch. Each of the methods uses a, feed coal tar pitch having a softening point in the range of 70°C to 160°C. The methods may, be carried out using appropriate conventional distillation equipment a wiped , film, evaporator, or a thin film evaporator.
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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 September 12, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 12, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 12, 2023.
- 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.