Mechanical timer including cam operated clapper and chime
CA 2197748 C · Owner: Maytag Corporation · Inventors: Lafrenz, Michael D.; Wunderlich, Daniel F.; Dunsbergen, Kirk M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A timer mechanism for an appliance such as a clothes dryer includes a pulser cam and a timer cam. The timer cam has a notch along its perimeter while the pulser cam has a step formed in its perimeter. The cams rotate in opposite directions with a cam follower biased against the cams. A clapper is connected to the cam follower and is adapted to strike a chime if the cam follower is aligned with the notch in the timer cam and the cam follower drops off the step in the pulser cam as the pulser cam rotates past the cam follower. The pulser cam is connected to the timer motor and continuously rotates at a first speed throughout a cycle while the timer cam is connected to the timer motor and the …
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 February 17, 1997 and granted November 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 17, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 17, 2019.
- 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.