Tap changer
CA 2249520 A1 · Owner: Wrede, Silke · Inventors: Dohnal, Dieter; Hopfl, Klaus; Wrede, Silke
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A tap changer has a bypass switch with a rotary pair of movable contacts engaging arc segmental fixed contacts of a length greater than the spacing between the movable contact which spacing is greater than the spacing between the fixed contacts of the bypass switch.
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 2, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 2, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 2, 2020.
- 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.