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Expired Canadian patentCanada

Gas detector for mines

CA 81663 A · Owner: Mackie, Matthew D. · Inventors: Mackie, Matthew D.

CIPO record

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.

Google PatentsCIPO record

Why it's free to use

  • Granted June 30, 1903. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 30, 1920.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledFebruary 9, 1903
GrantedJune 30, 1903
Term endedJune 30, 1920
Patent numberCA 81663 A
Classification (IPC)—

Timeline

Timeline From CIPO dates

190419061908191019121914191619181920Application filedFeb 9, 1903Patent grantedJune 30, 1903Term endedJune 30, 1920

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.