Expired Canadian patentCanada
Instrument for surveying bore holes
CA 137331 A · Owner: Maas, George Joseph · Inventors: Maas, George Joseph
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 December 12, 1911. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 12, 1928.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 14, 1911
GrantedDecember 12, 1911
Term endedDecember 12, 1928
Patent numberCA 137331 A
Classification (IPC)—
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.