Vacuum pump
CA 2747136 C · Owner: Edwards Limited · Inventors: Stones, Ian David; Stuart, Martin Nicholas; Schofield, Nigel Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A differentially pumped mass spectrometer system comprises a mass spectrometer having a plurality of pressure chambers; a vacuum pump attached thereto and comprising at least three pump inlets a first pumping section, a second pumping section downstream from the first pumping section and a third pumping section downstream from the second pumping section an outlet from a first, relatively low pressure chamber being connected to a first pump inlet through which fluid can enter the pump from the first chamber and pass through the first second and third pumping sections towards a pump outlet an outlet for a second, medium pressure chamber of the spectrometer being connected to a second pump …
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 23, 2004 and granted April 10, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 23, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 23, 2026.
- 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.