Shielded encapsulated vacuum interrupter
CA 2552220 C · Owner: Martin, Donald R. · Inventors: Martin, Donald R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A shielded encapsulated vacuum interrupter with a ceramic vacuum chamber and opposing conductive end caps is provided. One end cap is electrically connected to a fixed contact, while an opposing end cap is connected to a moving contact. The moving contact is actuatable with the fixed contact for opening or closing an electric circuit. A floating shield inside the vacuum chamber connected to the vacuum chamber ceramic wall and spaced from the fixed and moving contacts is isolated and has a floating voltage potential. A portion of the vacuum chamber exterior ceramic wall is coated with a semiconductive material and conductive voltage screens enclose a portion of the vacuum chamber …
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 September 22, 2004 and granted September 4, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 22, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 22, 2026.
- 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.