Cathode-ray tube having a stepped shadow mask
CA 1111893 A · Owner: Rca Corporation · Inventors: Morrell, Albert M.; Stone, Robert P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved color picture tube shadow mask has apertured portions through which electron beams pass to a phosphor screen, and other portions connecting the apertured portions through which the beams do not pass. The other portions are step risers aligned substantially parallel to electron beam paths at corresponding points within the tube and offset adjacent apertured portions relative to the screen. The structure permits reduction in mask-frame assembly thickness for tubes with spherical faceplates and also, facilitate construction of flat faceplate tubes.
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 November 3, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 3, 1998.
- 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.