Chilled piezoelectric hygrometer
CA 1301477 C · Owner: Letourneau, Michel · Inventors: English, Michel; Letourneau, Michel; Porlier, Claude
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A dew point hygrometer called a CHILLED PIEZOELECTRIC HYGROMETER, which is disclosed herein includes a dew point sensing element consisting of a piezoelectric quartz crystal resonator mounted on a Peltier cooler. The piezoelectric quartz crystal resonator is excited to its resonant frequency and cooled to the point of condensation of water vapor on its surface. As the condensation occurs the mass of the, condensed water vapor onto the piezoelectric quartz crystal resonator surface causes a change in the resonant frequency. A temperature sensor mounted on the surface of the piezoelectric quartz crystal resonator is use to monitor the temperature at which a dew deposit occurs. The digital …
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
- Granted May 26, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 26, 2009.
- 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.