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Expired Canadian patentCanada

Method of producing micron sized sulphur granules

CA 2199341 C · Owner: Laidler, James Kenneth · Inventors: Laidler, James Kenneth; Blackwood, Rodger; Kay, William Chee

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Abstract From the Canadian patent

A method of producing micron sized sulphur granules involving the following described steps. Firstly heating, sulphur until the sulphur becomes molten. Secondly heating, water and inducing movement of the heated water at velocity. Thirdly injecting an unbroken stream of the molten sulphur under pressures in excess of 500 p.s.i. into the heated water moving at velocity. An explosive dispersion of the molten sulphur into fine sulphur granules occurs enhanced by shear, forces exerted by the movement of the heated water at velocity. The described method is capable of producing spherical sulphur granules of less than 45 microns. In the preferred ranges spherical sulphur granules of less than 10 …

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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

  • Filed March 6, 1997 and granted November 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 6, 2017.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 6, 2019.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 6, 1997
GrantedNovember 26, 2002
Term endedMarch 6, 2017
Patent numberCA 2199341 C
Classification (IPC)C01B17/10 +1 more

Timeline

Timeline From CIPO dates

1998200020022004200620082010201220142016Application filedMarch 6, 1997Patent grantedNov 26, 2002Term endedMarch 6, 2017

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