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Expired Canadian patentCanada

Gastight conveying device for powdery substances

CA 492452 A · Owner: L'Air Liquide, Societe Anonyme Pour L'Etude Et L'Exploitation Des Procedes Georges Claude · Inventors: Max Jean Laborde; Lucien Daubray

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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.

Google PatentsCIPO record

Why it's free to use

  • Granted April 28, 1953. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 28, 1970.
  • 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—
GrantedApril 28, 1953
Term endedApril 28, 1970
Patent numberCA 492452 A
Classification (IPC)B05C

Timeline

Timeline From CIPO dates

195419561958196019621964196619681970Patent grantedApril 28, 1953Term endedApril 28, 1970

Sources & verification

Official CIPO records

Canadian Patents DatabaseClaims, description, documents and status.CIPO

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.com

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.