Mercury-free metal halide lamp
CA 2315492 A1 · Owner: Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh · Inventors: Stockwald, Klaus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mercury-free metal halide lamp with a warm white luminous colour the fill of, which comprises the following components: an inert gas which acts as a buffer gas; a first group of metal halides (MH) the boiling point of which is above, 1000°C (preferably above 1150°C) the first group comprising at , least Dy and Ca used simultaneously as metals, and the molar ratio of the two metal halides Ca-MH:Dy-MH being between 0.1 and 10; these are components with a low volatility, which are present in saturated form; a second group of metal halides the , boiling, point of which is below 1000°C (preferably below 900°C) the , second group, comprising at least one of the elements In Zn, Hf, Zr as metals; …
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
- Filed August 9, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 9, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 9, 2022.
- 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.