Solid state relay
CA 2106233 C · Owner: Carlo Gavazzi Services Ag · Inventors: Kristensen, Ove Styhm
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A solid state relay with a control terminal and a current controlled or voltage controlled solid state power switching device, which according to a signal at the control terminal is turned on or off, wherein the relay includes a first sensor sensing the control current or voltage a second, sensor sensing a voltage across the switching device and a, comparator to compare the sensor outputs and generate an alarm signal in response to an abnormal condition. The sensors include optically or magnetically coupled switching devices, and the comparator also receives the control signal.
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 September 15, 1993 and granted June 16, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 15, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 15, 2015.
- 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.