Method and device for forming a sheet-metal blank in particular for making a cathode tube mask, and cathode tube mask obtained according to this method
CA 2000059 A1 · Owner: De Smet, Gabriel · Inventors: De Smet, Gabriel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method and device for forming a sheet-metal blank in particular for making a cathode tube mask and cathode, tube mask obtained according to this method" ABSTRACT, The present invention relates to a method for forming a sheet-metal blank (1), in particular for making a cathode tube mask, on a press, according to which the peripheral part of the sheet-metal blank (1) is held over a small width in a peripheral member (30) the central, part of the sheet-metal blank (1) is formed according to, a given curvature, by deforming the punch (17) and the die (13) through the action of an upper bearing plate (19), a mechanical force is exerted on localized zones of the clamping member (30), moving …
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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 October 2, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 2, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 2, 2011.
- 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
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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.