Expired Canadian patentCanada
Desulphurization of naphthalene
CA 554331 A · Owner: Union Carbide And Carbon Corporation · Inventors: John R. Anderson; James V. Murray, Jr.
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 March 11, 1958. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 11, 1975.
- 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—
GrantedMarch 11, 1958
Term endedMarch 11, 1975
Patent numberCA 554331 A
Classification (IPC)B01D3/14
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.