Starter for igniting a gas and/or vapour discharge lamp
CA 1114890 A · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Chermin, Hubertus M.J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PHN.8604, 13-9-1977, ABSTRACT:, The invention relates to a starter for igniting a low-pressure sodium lamp. The starter is provided with an oscillator circuit consisting of an electric coil a first capacitor and a controlled semiconductor switching element. In accordance with the invention the starter also comprises a parallel circuit of a resistor having a positive temperature coefficient and a second capacitor this parallel circuit and the oscillator circuit being in series. This series circuit is connected between two electrodes of the lamp. In the case that a defective lamp must be replaced by a new lamp - the mains voltage being switched on - in spite of the hot state of the resistor …
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 December 22, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 22, 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.