Canadian application, no grantCanada
Process for making carbon electrode
CA 2120597 A1 · Owner: Aristech Chemical Corporation · Inventors: Stipanovich, John Jr.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Carbon electrode impregnating pitch is made from coal tar by centrifugation of the coal tar to remove particulates followed by, milling and distilling the remaining material.
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 30, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 30, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 30, 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.
FiledJuly 30, 1993
GrantedNo grant recorded
Term endedJuly 30, 2013
Patent numberCA 2120597 A1
Classification (IPC)C10C1/00 +2 more
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.