Method and apparatus for measuring the calorific value of a gas
CA 2318496 C · Owner: Hammond, Paul Steven · Inventors: Price, Barry Leonard; Thurston, Robert Richard; Hammond, Paul Steven
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus (2) comprises a chamber (4) to which a gas in question for example , natural gas is supplied through inlet (6) and leaves through outlet (8). The speed of sound SoS at ambient temperature is measured using any suitable method such as electronic control and calculating means (14) and an ultrasound emitter (10) and an ultra-sound receiver (12). The ambient temperatures Ta is observed by temperature sensor (22) and a thermal conductivity sensor , measures the thermal conductivity of the gas at two different temperatures above ambient temperature. One value ThCH of the thermal conductivity is measured at 70 ~C above ambient and the other value ThCL of the thermal conductivity is …
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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 January 8, 1999 and granted December 23, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 8, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 8, 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
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.