High-pressure mercury discharge lamp
CA 1135781 A · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Kuus, Gijsbert; De Ridder, Adriaan J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
1 PHN 9362, ABSTRACT:, High-pressure mercury discharge lamps with metal halide addition often reach the end of life prematurely as a result of leakage of the pinch seal. According to the invention this is prevented by coating a metal foil which is incorporated as a current lead-through conductor in a pinch seal with a layer of a second metal which is Ti, Y, La, Sc and Hf. If a part of an external current conductor situated in the pinch seal is also formed at, least at its surface, from one of the said second metals it prevents alkali metals escaping from the filling inside the discharge vessel.
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 November 16, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 16, 1999.
- 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.