Expired Canadian patentCanada
Water-soluble glass composition
CA 2542502 C · Owner: Werner, Karin · Inventors: Hahn, Karlheinz Ulrich Gerhard; Werner, Karin
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 zinc and bismuth containing, water-soluble glass composition comprising from 10 to 75 mole% P205, 5-50 mole % alkali metal oxide up to 40 mole% Zn0 and up , to 40 mole% Bi203.
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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 October 18, 2004 and granted July 23, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 18, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 18, 2026.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 18, 2004
GrantedJuly 23, 2013
Term endedOctober 18, 2024
Patent numberCA 2542502 C
Classification (IPC)C03C3/16 +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.