Key button switches
CA 2090001 A1 · Owner: Griffiths, Donald E. · Inventors: De'Ath, Roger M.; Griffiths, Donald E.; Kidston, William W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Title:, IMPROVEMENTS IN OR RELATING TO KEY BUTTON SWITCHES Abstract:, A key button structure for a keyboard of a data input device comprises a plastics base plate having an opening defining a switch site for a push button biassed to a raised inoperative position by a resiliently flexible elastomeric membrane integral with the base plate. Single and multi-button assemblies are disclosed in which the push button(s) are located on guide means integral with the base plate and the key button structure is secured to a carrier by attachment means Integral with the base plate.
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 19, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 19, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 19, 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.