Display apparatus
CA 2072191 C · Owner: Matsushita Electric Industrial Co. Ltd. · Inventors: Tateishi, Kozo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A display apparatus in which the focus shift and astigmatism of the electron beam caused in the CRT and its vicinity portion are reduced. Picture scenes of higher fidelity, higher acuteness and higher resolution can be obtained. In the electron beam shaped control circuit signals corresponding to a high-pass component a brightness, component in the image signals from the horizontal direction electron beam shaped detection deciding portion and signals, corresponding to the low-pass component in the image signals from the vertical direction electron beam shaped detection deciding portion are composed. Composite signals of parabolic waves are obtained by a driving voltage generating portion so …
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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 June 23, 1992 and granted January 12, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 23, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 23, 2014.
- 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.