Compound lightning arrester for low voltage circuits
CA 2008172 C · Owner: Kato, Giichior · Inventors: Kato, Giichior
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compound low voltage lightning arrester assembled in one unit by connecting in parallel a semiconductor lightning arrester element and a spark gap is proposed in order to secure the co-operation of said semiconductor lightning arrester element and spark gap by inserting a non-inductive resister in series connection into part of the connecting line of said semiconductor lightning arrester element.
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 January 19, 1990 and granted August 26, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 19, 2012.
- 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.