Expired Canadian patentCanada
Method of separating raw coal into coal with a low percentage of ashes and stone with a high percentage of ashes in a cyclone
CA 504614 A · Owner: De Directie Van De Staatsmijnen In Limburg, Handelend Voor En Namens Den Staat Der Nederlanden · Inventors: Freerk Jan Fontein
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 July 27, 1954. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 27, 1971.
- 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—
GrantedJuly 27, 1954
Term endedJuly 27, 1971
Patent numberCA 504614 A
Classification (IPC)B03D1/02
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.