Barrier of condenser type for field control in transformer bushing terminals
CA 2019182 C · Owner: Strandberg, Lennart · Inventors: Strandberg, Lennart; Holmstrom, Lars
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a condenser type barrier for field control in transformer bushings and their connection to the conductor of a transformer winding for transformers used in HVDC convertor plants. The condenser barrier is arranged as a solid of revolution with concentrically laid condenser layers. It is formed from both ends with inwardly-directed straight frustums of cones with equally large smallest bases, between which the condenser barrier is formed as a concentric inner, straight circular cylinder.
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 18, 1990 and granted May 3, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 18, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 18, 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.