Colour display tube
CA 1180368 A · Owner: Philips Electronics N.V. · Inventors: Van Der Waal, Jan; Compen, Johannes M.A.A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a colour display tube comprising a colour selection electrode placed before the display screen. The colour selection electrode is coated at least on the side remote from the display screen with a layer which comprises between the colour selection electrode apertures 0.2 to 2 mg/cm2 of a heavy metal or a heavy metal compound. The heavy metal has an atomic number exceeding 70. Such a layer has a high electron reflection coefficient so that of the electron impinging on the colour selection electrode less energy is absorbed by the colour selection electrode. As a result of this the overall doming or local doming of the colour selection electrode treated according to the …
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 January 2, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 2, 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.