Expired Canadian patentCanada
Sharpening device for safety razors
CA 294840 A · Owner: Weaton Lipyeatt Raleigh Amesbury · Inventors: Weaton Lipyeatt Raleigh Amesbury
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 November 19, 1929. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 19, 1946.
- 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—
GrantedNovember 19, 1929
Term endedNovember 19, 1946
Patent numberCA 294840 A
Classification (IPC)B24B3/00
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.