Circuit arrangement and method for supplying pulse current to electroplating or etching systems
CA 2282391 A1 · Owner: Maurer, Manfred · Inventors: Maurer, Manfred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to circuitry and a method for supplying electrolytic cells with a pulse current for use in electroplating plants. Two galvanorectifiers (5,32) and a change-over switch (12) with two respective separate switches (23,24) are included to provide each electrolytic cell with power. One respective rectifier output is connected by a first line (34,35) to the electrolytic cell. The other rectifier outputs are respectively connected to the change-over switch inputs by a second line (34,35). The change-over switch output (18) is joined to the other connection of the electrolytic cell. A capacitor (20,21) is connected between the first and second line. Periodic pulses are …
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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 February 2, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 2, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 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.