Discharge tube and method of manufacturing same
CA 2033601 A1 · Owner: Shishido, Masataka · Inventors: Mitani, Tetsuya; Suzuki, Takahisa; Sato, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A discharge tube has an activated layer made of, one of an alkali metal compound or an alkaline earth metal compound, formed on a surface other than a discharge surface of one of a pair of opposed electrodes in the tube. The electrodes are hermetically sealed to a cylindrical cover, and a gas, preferably an inert gas such as argon, fills the hermetically-sealed enclosure.
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 January 4, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 4, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 4, 2013.
- 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.