Expired Canadian patentCanada
Method of removing gel forming materials from methylaluminoxanes
CA 2102198 C · Owner: Ethyl Corporation · Inventors: Sangokoya, Samuel A.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Gel and gel forming materials are removed from methylaluminoxane by aromatic hydrocarbon solvent solution of the methylaluminoxane with an aliphatic hydrocarbon solvent and then separating the precipitated solids from the methylaluminoxane solution.
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 4, 1993 and granted July 8, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 4, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 4, 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.
FiledMarch 4, 1993
GrantedJuly 8, 1997
Term endedMarch 4, 2013
Patent numberCA 2102198 C
Classification (IPC)C07F5/06
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.