Refrigerator and freezer monitoring device
CA 1097761 A · Owner: Kelley, Joseph B. · Inventors: Kelley, Joseph B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A temperature-sensitive switch in a refrigerator or freezer remains open when the temperature is below a predetermined level and closes when the temperature rises above the predetermined level. A visible alarm and an audible alarm are provided outside the refrigerator and freezer. A battery is electrically connected to the visible and audible alarms via the temperature sensitive switch whereby the temperature in the refrigerator or freezer rises above the predetermined level, the alarms are actuated.
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 March 17, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 17, 1998.
- 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.