Expired Canadian patentCanada
Instrument for indicating the phase and frequency relations of alternating current circuits
CA 78166 A · Owner: The Westinghouse Electric And Manufacturing Company · Inventors: Conrad, Frank
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 11, 1902. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 11, 1919.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 1, 1902
GrantedNovember 11, 1902
Term endedNovember 11, 1919
Patent numberCA 78166 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.