Display device using a discharge lamp
CA 1185791 A · Owner: Chow, Shing C. · Inventors: Chow, Shing C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Display device using a discharge lamp for displaying a series of message formed of characters, numerals or symbols by combining various kinds of discharge lamps which are different in shape and size. Inert gas is charged in a glass tube of the discharge lamp one of the electrodes, is provided within the glass tube and the other is provided outside of the glass tube. Pulse signal or AC signal generator is provided and serves to supply such signals to both electrodes. The various kinds of discharge lamps are combined and arranged on the surface plate of a display unit. A plurality of display units are combined and magnetically connected to a display panel. A plurality of electrically …
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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 April 23, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 23, 2002.
- 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.