Expired Canadian patentCanada
Photographic apparatus and dark room
CA 117751 A · Owner: Willyerd, John B. · Inventors: Willyerd, 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 April 13, 1909. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 13, 1926.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJanuary 9, 1909
GrantedApril 13, 1909
Term endedApril 13, 1926
Patent numberCA 117751 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.