Electron tube provided with a cylindrical ceramic envelope part
CA 1065386 A · Owner: Nippon Telegraph And Telephone Public Corporation · Inventors: Kawashima, Fujio; Orui, Ryuzo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electron tube of the type such as a traveling-wave tube, which, includes a cylindrical ceramic envelope part jointed to two spaced metallic electrodes between which a high D.C. voltage is applied is disclosed. The ceramic part has its inner diameter progressively increased so that its inner circumferential surface is flared from the end at which the negative potential electrode is jointed towards the end at which the positive potential electrode is jointed. Because electrons emitted from the cathode of the tube are less likely to impinge on this sloping surface arc gener-, ation is reduced or prevented. Additionally a metallic shield connected, concentrical b to the negative electrode is …
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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
- Granted October 30, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 30, 1996.
- 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.