High pressure sodium lamp having improved efficacy
CA 1203559 A · Owner: Gte Products Corporation · Inventors: Waymouth, John F.; Wyner, Elliot F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The efficacy of a high pressure sodium arc discharge lamp is increased by reducing the wall loading and/or current density of the arc tube. Adequate arc tube wall temperature of at least about 1100°C is maintained by the use of radiant or thermal insulation or infrared reflection films or by the use of an arc tube material having a low thermal radiant emittance. The lamp is constructed from a non-vitreous arc tube having electrodes sealed into its ends. A metal framework provides support for the arc tube and an electrical path to the upper electrode.
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 April 22, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 22, 2003.
- 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.