Safety circuit
CA 2187101 C · Owner: Schlicker, Michael · Inventors: Schlicker, Michael; Schmitz, Frank
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Safety circuits with an actuating device for electrical appliances where the actuating device is capable of being operated by means of two key buttons or switch stacks are of use in many different areas of application. In order to create a generally suitable safety circuit which is very simple and clear and which therefore brings with it low costs which however stands up to all safety criteria including the avoidance of any manipulation it is proposed that the two key buttons (S1 S2) each have a break contact (s1~, s2~) and a make contact (s1s s2s) and act in combination with an associated driver stage (2) preferably a transistor driver stage with transistors (Q1 Q2, Q3, Q4), that 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 October 3, 1996 and granted August 29, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 3, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 3, 2018.
- 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.