Color picture tube having improved shadow mask-frame assembly support means
CA 2132187 C · Owner: Keller, Raymond Edward · Inventors: Piascinski, Joseph John; Sies, Neil Edward; Keller, Raymond Edward
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 includes an evacuated glass envelope having a faceplate panel with a cathodoluminescent screen comprising different color-emitting phosphor elements disposed thereon. The panel includes a shadow mask-frame assembly mounted therein by support means located at peripherally spaced positions within the panel. The shadow mask includes an apertured portion the, apertures of which are in register with the phosphor elements of the screen. The support means at each spaced position includes a stud attached to the glass envelope, a spring having an aperture therein for engaging the stud, and a plate welded between the spring and the mask-frame assembly. The improvement …
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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
- Filed September 15, 1994 and granted December 28, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 15, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 15, 2016.
- 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.