Vacuum interrupter
CA 1283151 C · Owner: Kabushiki Kaisha Meidensha · Inventors: Tamaki, Nobuaki; Kawakami, Hideo; Sakuma, Shinzo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An inventive vacuum interrupter exhibits a high interruption performance. The interrupter includes a metal end plate constituting part of its vacuum envelope and a coil disposed outside the vacuum envelope and near the metal end plate and generating an axial magnetic field parallel to a path of an arc in an arcing gap between a pair of separable contact within the vacuum envelope. The contact near the coil is made of a material superior in interruption performance to the end plate and is mounted with a clearance onto the end plate. The clearance is at least 2 mm and at most 30% of the diameter of the coil-side contact. - 35 -
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
- Granted April 16, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 16, 2008.
- 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.