Flow control system
CA 2498034 C · Owner: Ab Sciex Llc · Inventors: Arnold, Don Wesley; Rehm, Jason E.; Paul, Phillip H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method and apparatus for providing liquid flow at a controlled rate less than 100 microliters/minute, and for varying the flow rate in a desired way. A liquid is driven through a conduit by pressure. The rate of flow of the liquid through the conduit is measured and compared to a desired value. The resulting information is then used to make any desirable changes in the driving pressure. In one embodiment, which is particularly suitable for a mixture of liquids to be supplied to a gradient liquid chromatography column the rate of , flow of each of two or more different liquids is controlled individually and , the liquids are then mixed together.
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 September 17, 2003 and granted July 10, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 17, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 17, 2025.
- 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.