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Expired Canadian patentCanada

Sublimation method

CA 1312446 C · Owner: Unilever Plc · Inventors: Bee, Rodney David; Palmer, Anthony Martin

CIPO record

Overview

Drawings and full text

Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

A gaseous mixture comprising an edible gas-hydrateforming material and gaseous water is positively conveyed to a spot where temperature and pressure conditions are arranged in conformity with the phase diagram water/clathrate/gas-hydrate-forming material suitable for forming gas-hydrate-clathrate of said components.

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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 January 12, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 12, 2010.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 16, 1989
GrantedJanuary 12, 1993
Term endedJanuary 12, 2010
Patent numberCA 1312446 C
Classification (IPC)C01B31/20 +2 more

Timeline

Timeline From CIPO dates

1990199319961999200220052008Application filedJune 16, 1989Patent grantedJan 12, 1993Term endedJan 12, 2010

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.