Oxygen analyzer
CA 2124113 C · Owner: Invensys Systems, Inc. · Inventors: Fletcher, Kenneth S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An analyzer (10) for detecting a selected chemical (such as oxygen) in a process fluid includes a plurality of electrodes (12 14, 22) that are separated from the fluid by a membrane (18) that is permeable to the selected chemical, each of the electrodes (12 14) when energized producing a signal in response to the selected chemical in the fluid. The selected chemical level in the process fluid is determined based on the signal produced by a first one of the electrodes (12) and the determined level is used with the signal produced by a second one of the electrodes (14) to detect whether the membrane (18) has become faulty (e.g. fouled by materials in the process fluid).
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, 1993 and granted November 18, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 17, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 17, 2015.
- 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.