Keyboard apparatus and method of making
CA 1055848 A · Owner: Texas Instruments Incorporated · Inventors: Keough, Laurence J.; Butts, Bruce D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, A keyboard-operated electronic apparatus such as an electronic calculator is made by forming a dielectric card with a plurality of recesses in one card side. Preferably the card is formed with a number of apertures extending through the card. Electrically conductive films are deposited in a selected pattern on the recessed card to define first and complementary contacts within each card recess and to define circuit paths which are connected to these contacts in a selected manner. Electrically conductive elements of a dished configuration are disposed in the respective card recesses to be located by the recesses in engagement with the first contacts in the …
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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 June 5, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 5, 1996.
- 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.