Dynamic focusing device for cathode ray tube
CA 2107156 C · Owner: Matsushita Electric Industrial Co. Ltd. · Inventors: Kawashima, Masahiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A dynamic focusing device for cathode ray tubes is disclosed, which comprises a crosshatch pattern generator for providing a surface of cathode ray tubes with a crosshatch pattern indicating an adjustment point at which focusing control is carried out, input means for choosing the adjustment point and for controlling the focus at the point correction data setting, means having a memory unit for storing a correction data necessary for proper focusing, interpolating data calculating means for providing an interpolation data between two adjacent adjustment points located in a vertical direction a latch and, digital to analog converter for converting said correction and interpolation data into …
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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 September 28, 1993 and granted May 11, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 28, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 28, 2015.
- 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.