Expired Canadian patentCanada
Process of separating graphite from wollastonite
CA 85166 A · Owner: Van Krom, Stanley · Inventors: Krom, Stephen Reuben; Van Krom, Stanley
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 February 2, 1904. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 2, 1921.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 17, 1903
GrantedFebruary 2, 1904
Term endedFebruary 2, 1921
Patent numberCA 85166 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.