Apparatus and sensor unit for monitoring changes in a physical quantity with time
CA 2108643 C · Owner: Baker, John Frederick Charles · Inventors: Phillips, John Meurig; Baker, John Frederick Charles
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus for monitoring changes in a physical quantity with time comprises a reader unit and at least one sensor unit containing electronic components arranged to measure said quantity at predetermined time intervals and to store measurement data with corresponding time data. Each sensor unit also contains communication means for transferring said measurement data and said time data from the sensor unit to the reader unit, and the sensor unit also contains an inductive coupling means to receive energy from the reader unit to power the communication means. Each sensor unit is encapsulated with a food grade plastic and is typically the size of a credit card, thereby providing a small and …
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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 October 18, 1993 and granted January 19, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 18, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 18, 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.