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Expired Canadian patentCanada

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CA 684145 A · Owner: William H. English · Inventors: William H. English

CIPO record

Overview

Drawings and full text

Its claims, description and drawings are in the Canadian Patents Database.

Open the CIPO record

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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.

Why it's free to use

  • Granted April 14, 1964. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 14, 1981.
  • 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 14, 1964
Term endedApril 14, 1981
Patent numberCA 684145 A
Classification (IPC)F42B33/00

Timeline

Timeline From CIPO dates

196519671969197119731975197719791981Patent grantedApril 14, 1964Term endedApril 14, 1981

Sources & verification

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