Method of manufacturing grid electrodes for electron tubes and grid electrode manufactured according to the method
CA 1071299 A · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Krol, Johannes W. A.; Lersmacher, Bernhard; Seifert, Horst
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a method of manufacturing a pyrolytic graphite grid electrode in which after formation of the grid the, electrode is annealed at a temperature of 700° to 1200° C in a reactive atmosphere to remove carbon particles adhering to the electrode surface. - 8 -
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 February 5, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 5, 1997.
- 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.