Step-wise process to recover or eliminate biological substances by flotation from underlayered colloidal medium
CA 2428041 C · Owner: Pertoft, Hakan · Inventors: Pertoft, Hakan; Norling, Borje
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a method and kit for discontinuous density gradient centrifugation to separate a minimum of two substances in a sample. In the method and kit use is made of colloidal density media and low density solutions, such as buffer solutions. The sample is mixed with colloidal media and placed at the bottom of a centrifuge tube and desired substances flotate to the lower density media following centrifugation.
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 November 21, 2001 and granted August 7, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 21, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 21, 2023.
- 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.