Method of producing micron sized sulphur granules
CA 2199341 C · Owner: Laidler, James Kenneth · Inventors: Laidler, James Kenneth; Blackwood, Rodger; Kay, William Chee
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract 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.
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.