Expired Canadian patentCanada
Bore-hole apparatus
CA 276357 A · Owner: Matvey Alcunovitch Capeliuschnicoff · Inventors: Matvey Alcunovitch Capeliuschnicoff
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 20, 1927. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 20, 1944.
- 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—
GrantedDecember 20, 1927
Term endedDecember 20, 1944
Patent numberCA 276357 A
Classification (IPC)E21B4/06
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.