Solid state current controlled interruption system
CA 2074167 C · Owner: Studtmann, George H. · Inventors: Studtmann, George H.; Ward, Donald H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A solid state circuit interruption arrangement monitors a current path to provide protection to both a load (12) and a solid state switch (10). The arrangement includes an energy absorber (18) for absorbing energy from the current path in response to the solid state switch (10) interrupting the current path and a control circuit , (20) for periodically generating the interrupt signal to interrupt the current path for prescribed intervals and to control the current supplied to the load (12) between a maximum current level and a minimum current level.
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 November 27, 1991 and granted August 31, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 27, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 27, 2013.
- 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.