Colour television display tube with coma correction
CA 1265839 C · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Sluyterman, Albertus A.S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Colour television display tube with coma correction. Colour television display tube comprising an electron gun system (5) of the "in-line" type and an electromagnetic deflection unit. The extremity of the electron gun system is provided with field shapers comprising, for example, annular elements (34,34') of a material having a high magnetic permeability which are positioned around the two outer beams and are adapted to compensate coma. These elements are located in a more advanced position towards the screen than is usual in positions where the outer beams have undergone a pre-deflection of at least 0.5 mm so as to reduce the "green droop" (= anisotropic Y-coma) and to reduce the need of a …
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 February 13, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 13, 2007.
- 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.