High-pressure sodium vapour discharge lamp with mercury and xenon
CA 1111892 A · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Brugmans, Marinus F.; Jacobs, Cornelis A.J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a high-pressure sodium vapour discharge lamp provided with a discharge tube containing mercury and xenon as well as sodium. The sodium vapour pressure - in the operating condition of the lamp is within a given range. In accordance with the invention a xenon filling pressure is used which is between 50 and 1000 torr. As a result a lamp can be obtained which haa high luminous efficacy in the operating condition.
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 3, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 3, 1998.
- 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.