Discharge lamp lighting device
CA 2013174 C · Owner: Okude, Akio · Inventors: Okude, Akio; Ueoka, Atsushi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A discharge lamp lighting device includes a DC power supplying means which supplies as superposed on a high frequency power fed to a low-tension, mercury-arc discharge lamp a DC power of a level capable of maintaining a discharge upon low light flux lighting the, lamp being thereby made stably lighted to an extremely low level of the flux of light.
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 March 27, 1990 and granted September 13, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 27, 2012.
- 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.