Expired Canadian patentCanada
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CA 216809 A · Owner: The Canadian National Carbon Company · Inventors: William Bronie
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
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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
- Granted March 14, 1922. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 14, 1939.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedMarch 14, 1922
Term endedMarch 14, 1939
Patent numberCA 216809 A
Classification (IPC)F21L
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.