Process for the filtration of suspensions containing sulfur
CA 2114337 C · Owner: Kronos, Inc. · Inventors: Hartmann, Achim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
To improve the separation of dispersedly precipitated sulfur from a washing solution used, in the oxidative washing of hydrogen sulfide containing waste gases the , suspension is heated, before filtration to about 45° C to 70° C. Such heating causes the sulfur contained in the solution, to coagulate into large flocks and form a mass of high purity sulfur which is largely non-, thixotropic. This mass, often called a filter cake can be washed and utilized , in a large number of ways as a source of sulfur.
Read the whole patent
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 January 27, 1994 and granted May 14, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 27, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 27, 2016.
- 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.