Colour display tube
CA 1112281 A · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Kersten, Adrianus M.; Serio, Giovanni; Verhoeven, Martinus C.M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
By providing, in a colour display tube having a magnetic screening cap, four resilient metal plates extending radially and in the direction of the corner points of the display screen at the edge of the end having the smallest diameter of said display cap which plates press against the electrically conductive innner coating of the cone, it is prevented that electrons impinge upon the display screen between the screening cap and the conductive inner coating of the cone. - 8 -
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 10, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 10, 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.