Dual shunt current regulator
CA 2066636 C · Owner: Tessmer, Earl John · Inventors: Tessmer, Earl John; Haun, Andy Allen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A current regulator circuit for shunting excess current from a current supply (14) utilizes two separate shunting paths (52 68) depending on the amount of excess current on the supply line. The first shunting circuit is activated when the current exceeds some minimum level established by a zener diode (50). The second current shunting circuit is selectively activated by a switching circuit (60) which compares the current in the first shunting circuit to a reference voltage (58) that is proportional to the line current. This arrangement is advantageous in that it shunts excess current without generating significant levels of heat or adversely affecting current sensing devices.
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 July 22, 1991 and granted May 11, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 22, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 22, 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.