Expired Canadian patentCanada
Electron-gun system
CA 1296048 C · Owner: Reule, Hans · Inventors: Reule, Hans; Kimmel, Helmut
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a cathode-ray tube with a thick grid No. 2 in the electron-gun system, current transfer into grid No. 2 may result in a lack of picture sharpness. To avoid this error the aperture, in grid No. 2 has a widening of conical shape or stepped diameter.
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 18, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 18, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 31, 1988
GrantedFebruary 18, 1992
Term endedFebruary 18, 2009
Patent numberCA 1296048 C
Classification (IPC)H01J29/50 +1 more
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.