Method of checking the rate of removal of pyrogenic substances, in particular viruses, from organic material
CA 2115069 C · Owner: Larson, Marcel P. · Inventors: Larson, Marcel P.; Becker, Gerhard; Heidl, Reiner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In order to check the rate of removal of pyrogenic substances, in particular viruses from, organic material, the material to be purified is passed through an ultrafilter or an ultrafiltration unit whose virus-removal rate has already been determined by passing viruses of the Leviviridae family or other comparable, small bacteriophages through the filter or filtration unit, the virus titer determined before and after the filtration operation and the virus-removal rate thus calculated. Before or after determining the virus-removal rate, a given pressure is applied to the filter or filtration unit in a gas pressure-hold test and the decrease in pressure over a given period is measured. After …
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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 August 5, 1992 and granted December 19, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 5, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 5, 2014.
- 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
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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.