Single ended high intensity discharge lamp with a specific volume
CA 1305996 C · Owner: Honda, Kazuo · Inventors: Honda, Kazuo; Matsuura, Atsushi; Iwafuji, Yasuhiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A high intensity discharge lamp includes an envelope formed of vitreous high temperature resistant material, and a pair of electrodes each having a metal rod and an arc supporting electrode, each of the metal rods being sealed at one end of the envelope. The lamp further includes a portion for adjusting the temperature at the wall of the envelope adjacent to the arc supporting rods, to minimize the differences in the wall temperature under different lighting postures of the lamp whereby the luminous efficiency of the lamp is substantially independent of the lighting postures of the lamp.
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 August 4, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 4, 2009.
- 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.