Flat keyboard switch
CA 2061565 C · Owner: Kobayashi, Makio · Inventors: Kobayashi, Makio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A flat keyboard switch comprises a printed circuit board having a plurality of fixed contacts and a light emitting element provided thereon a diaphragm, disposed above the fixed contacts and serving as a movable contact for electrically connecting the fixed contacts to each other, a surface sheet having an indicium printed at a portion thereof above the diaphragm, the indicium being made of a material having a light transmitting property, a movable element disposed between the diaphragm and the surface sheet a, light introducing plate disposed in the neighborhood of the light emitting element for scattering light emitted from the light emitting element toward the movable element, and 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
- Filed February 20, 1992 and granted December 23, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 20, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 20, 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.