Gas-and/or vapour discharge lamp
CA 1055099 A · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Van Der Werf, Jan E.; Van Tongeren, Hendricus F. J. J.; Heuvelmans, Jean 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 gas and/or vapour discharge lamp which is provided with a discharge tube and an outer bulb which envelops this tube whilst the heat insu-, lation in the space between the discharge tube and the outer bulb can be changed. According to the invention the heat insulation is changed by means of a reversible hydrogen getter which is located in the space between the outer bulb and the discharge tube. In this way it is obtained that the lamp can. either be operated without a stabilizing ballast or that it is less sensitive to variations in the mains supply. - 12 -
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 May 22, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 22, 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.