Expired Canadian patentCanada
Production of methanol from the organic materials present in spent pulping liquors, with the simultaneous recovery of the pulping base and sulphur values present in said liquors
CA 733546 A · Owner: Pulp And Paper Research Institute Of Canada · Inventors: Prahacs, Steven
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
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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 May 3, 1966. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 3, 1983.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 17, 1964
GrantedMay 3, 1966
Term endedMay 3, 1983
Patent numberCA 733546 A
Classification (IPC)C07C29/12 +1 more
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.