Polymer electrolytes and their preparation
CA 2098159 C · Owner: Pemeas Gmbh · Inventors: Osan, Frank; Helmer-Metzmann, Freddy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
polymer electrolytes are described that comprise a sulfonated aromatic polyether ketone, e.g. of the formula II, where, A is from 0.2 to 1, c is from 0 to 0.8 and, a + c = 1. The polymer electrolytes are prepared by dissolving an aromatic polyether ketone in 94-97% by weight sulfuric acid and adding a sulfonating agent, e.g. oleum to the, solution until the sulfuric acid concentration is from 98 to 99.9 % by weight.
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 June 10, 1993 and granted April 8, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 10, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 10, 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.
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.