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Expired Canadian patentCanada

Process for the production of a granule-shaped composition comprising agricultural chemical compound

CA 1297697 C · Owner: Kobayashi, Toshiyuki · Inventors: Kobayashi, Toshiyuki; Uomoto, Katsuhito; Takeda, Nobuo

CIPO record

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

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Abstract From the Canadian patent

A granule-shaped composition containing an agricultural chemical compound and a high proportion of an anionic surface-active agent of selected types in an effective amount to enhance the useful biological activity of said agricultural chemical compound may readily be produced by a process wherein a concentrated aqueous solution or slurry containing said agricultural chemical compound and the anionic surface-active agent at selected ratios, as well as one or more optional additives such as solid vehicle or water-soluble extender is atomized by means of a spray nozzle of specified outlet orifice diameter and is spray-dried in a spray-drying tower chamber according to counter-current flow …

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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 24, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 24, 2009.
  • 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 30, 1987
GrantedMarch 24, 1992
Term endedMarch 24, 2009
Patent numberCA 1297697 C
Classification (IPC)B01J13/02 +2 more

Timeline

Timeline From CIPO dates

19881991199419972000200320062009Application filedJune 30, 1987Patent grantedMarch 24, 1992Term endedMarch 24, 2009

Sources & verification

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