Switching cirucit protection apparatus and method
CA 2072296 C · Owner: Kabushiki Kaisha Toshiba · Inventors: Kanai, Takeo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a switching circuit having multiple parallel circuits having at least one switching element having a characteristic of firing by themselves due to over-voltage this invention is to provide a switching circuit protection apparatus which prevents the flowing of a current concentrated in the first of the parallel circuits to fire due to over-voltage. The apparatus in this invention comprises a switching circuit composed by connecting in parallel multiple circuits having at least one switching element having a characteristic of self-firing due to over-voltage detecting, means for detecting the self-firing of the switching element in the switching circuit, and firing means for applying an …
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 June 25, 1992 and granted October 28, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 25, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 25, 2014.
- 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.