Process for the production of naphthalene
CA 1234162 A · Owner: Kuchar, Joseph · Inventors: Guerriero, Salvatore; Carmichael, Ralph W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing a refined naphthalene of mothball colour-stable quality made from coal-derived crude naphthalene oil. A large number of stages is avoided, and the process does not require sulfuric acid washing and environmental problems associated with the disposal of acid sludge. The process comprises crystallizing naphthalene from a solution of crude naphthalene in methanol followed by clay treatment to produce refined naphthalene.
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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 15, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 15, 2005.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.