Expired Canadian patentCanada
Selective demettalation of zeolites and related materials
CA 2113283 C · Owner: Strohmaier, Karl Gottlieb · Inventors: Vaughan, David Evan William; Strohmaier, Karl Gottlieb
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for demetallating crystalline molecular sieve materials by removing a transition metal in the sieve framework with a complexing agent.
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 January 12, 1994 and granted January 5, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 12, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 12, 2016.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJanuary 12, 1994
GrantedJanuary 5, 1999
Term endedJanuary 12, 2014
Patent numberCA 2113283 C
Classification (IPC)B01J20/30 +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.