Rubber dome/mylar switch
CA 2118441 C · Owner: American Telephone And Telegraph Company · Inventors: Merriman, Roger Alan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rubber dome switch assembly has a first contamination resistant sheet which overlies a circuit board upon which are switch footprints. The first sheetis apertured to expose the switch footprints and a second contamination resistant sheet overlies the first sheet and has switch closure pads on the underside thereof, each of which is adapted to bear against the corresponding switch footprint to close the switch. A third sheet is adapted to overlie the second sheet and has switch buttons formed thereon each adapted to bear against the second sheet to force the closure pad into contact with the corresponding switch footprint. A faceplate member overlies the third sheet. Means are provided for …
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 October 19, 1994 and granted August 11, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 19, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 19, 2016.
- 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.