Forming a shadow mask from a flat blank
CA 1237168 A · Owner: Rca Corporation · Inventors: Ragland, Frank R. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A punch and pad for forming a square planar shadow mask have curved outer edges. A pair of dies respectively receiving the punch and pad have straight inner edges. The dies clamp a flat shadow mask blank and, the punch is lowered to only partially form the shadow mask. The mask is then unclamped, and the punch is fully lowered towards the pad, to complete the forming of the mask without wrinkles.
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 May 24, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 24, 2005.
- 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.