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Expired Canadian patentCanada

Method for the preparation of a bicarbonate sorbent in flue gas desulfurization

CA 1257764 A · Owner: Church & Dwight Co. Inc. · Inventors: Sarapata, James S.; Shaffery, Raymond

CIPO record

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Abstract From the Canadian patent

A process for the dry carbonation of an alkali metal or ammonium carbonate, utilizing a low carbon dioxide-containing carbonating gas stream and more par-, ticularly, a process for the production of a bicarbonate sorbent useful in the desulfurization of flue gases from the low carbon dioxide-content flue gases themselves.

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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 July 25, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 25, 2006.
  • 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 28, 1985
GrantedJuly 25, 1989
Term endedJuly 25, 2006
Patent numberCA 1257764 A
Classification (IPC)B01J8/00 +2 more

Timeline

Timeline From CIPO dates

1986198919921995199820012004Application filedJune 28, 1985Patent grantedJuly 25, 1989Term endedJuly 25, 2006

Sources & verification

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