Method of forming hot cathodes
CA 1212714 A · Owner: Nokia (Deutschland) Gmbh · Inventors: Weiss, Eberhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method of Forming Hot Cathodes A method is disclosed which permits instant heat cathodes for color-picture tubes to be formed in a single process step and avoids the formation of an activated barium oxide deposit on the grid cylinder This is achieved by alternately switching the heater current on and off with the operating voltages applied, the heater voltage and the "on" and "off" periods of the heater current being chosen so that averaged over the "on" and "off" periods the rated, heating power and the rated power dissipation are maintained during the formation process, and that, when the temperature of the emitting material decreases during the "off" periods, no saturation of the …
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 October 14, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 14, 2003.
- 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.