Semiconductor valve
CA 2107934 C · Owner: Kabushiki Kaisha Toshiba · Inventors: Seki, Nagataka
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A semiconductor valve including a plurality of series-connected semiconductor devices and a plurality of capacitors. Each of the capacitors is connected in parallel to one of the semiconductor devices respectively. Each of the semiconductor devices is a switching valve device having a pair of main electrodes and at least one control electrode. The semiconductor devices are such that a first variation in quantities with respect to tail charges on turn-off of the semiconductor devices is within a first prescribed value.
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 7, 1993 and granted May 1, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 7, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 7, 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.