Fluid overfill probe with anti-reflective guard
CA 2285262 C · Owner: Harding, Michael J. · Inventors: Harding, Michael J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optically-based fluid overfill prevention probe has an anti-reflective guard which prevents light external to a prism of the probe from reaching a photodetector of the probe. The probe has a light source which couples light into a prism that is detected by a photodetector when it is internally reflected within the prism. When the prism is contacted by fluid in a contained being monitored, the light from the light source exits the prism and is no longer detected by the photodetector. To avoid the light exiting the prism from being accidentally reflected back into the prism in a direction which would allow it to be detected by the photodetector the anti-reflective , guard is located …
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 January 7, 1999 and granted December 10, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 7, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 7, 2021.
- 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.