Expired Canadian patentCanada
Reversible ratchet device
CA 554530 A · Owner: Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of National Defence · Inventors: Witchell, John B.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordRead 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, and the Claude kit works from them.
Why it's free to use
- Granted March 18, 1958. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 18, 1975.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 20, 1955
GrantedMarch 18, 1958
Term endedMarch 18, 1975
Patent numberCA 554530 A
Classification (IPC)F16H19/00 +2 more
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.