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Expired Canadian patentCanada

Spring grinding machine

CA 174635 A · Owner: Sleeper, Frank Henry · Inventors: Sleeper, Frank Henry

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 January 23, 1917. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 23, 1934.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 30, 1916
GrantedJanuary 23, 1917
Term endedJanuary 23, 1934
Patent numberCA 174635 A
Classification (IPC)—

Timeline

Timeline From CIPO dates

191719191921192319251927192919311933Application filedNov 30, 1916Patent grantedJan 23, 1917Term endedJan 23, 1934

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.