Ceramic discharge lamp with leadthroughs protected
CA 1060524 A · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Jacobs, Cornelis A.J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Electric discharge lamps having a ceramic lamp vessel and current leadthroughs of niobium or tantalum cannot be operated in a nitrogen-containing atmosphere or in air due to attack of the current leadthroughs by the surrounding gas. According to the invention those parts of the, current leadthroughs which during operation have a temperature of more than 500°C and more than 350°C respectively, are, screened from the surrounding gas by means of ceramic mouldings which are connected to the current leadthroughs in a gas-tight manner by means of sealing material. As a result of this the lamps according to the invention can be operated in a nitogen-containing atmosphere and in air respectively. …
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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 August 14, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 14, 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.