Expired Canadian patentCanada
Process for centrifugally spinning pitch carbon fibers
CA 2012191 C · Owner: E. I. Du Pont De Nemours And Company · Inventors: Matthews, Abraham
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mesophase pitch centrifugally spun over a lip of the centrifugal rotor can be protected from coke and tar formation by conveying the molten pitch to the rotor's lip through channels within the rotor.
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 March 14, 1990 and granted December 19, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 14, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 14, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 14, 1990
GrantedDecember 19, 2000
Term endedMarch 14, 2010
Patent numberCA 2012191 C
Classification (IPC)D01F9/15 +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.