Optical keyboard with common light transmission members
CA 1187154 A · Owner: International Business Machines Corporation · Inventors: Sublette, Jerry M.; Paterson, Robert L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, A keyboard assembly is constructed of first light transmission members, second light transmission members a, key actuation assembly having a matrix of keybuttons plural light source assembly and plural sensor assembly. Each light source on assembly is exclusively and sequentially energized causing its light to be transmitted through the first light transmission member to be split up and deflected downwardly by the surfaces and then rightwardly by the surfaces to emanate through the surfaces to enter the surfaces of the second light transmission member. Actuation of a keybutton causes its associated interrupter to assume a light blocking position between the first light …
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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
- Granted May 14, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 14, 2002.
- 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.