Canadian application, no grantCanada
Interactive programmable interface for relegendable lcd keyswitches
CA 2175682 A1 · Owner: Caldwell, John · Inventors: Barry, James Anthony; Bannon, William Peter Roger; Caldwell, John
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An interface circuit for interfacing a relegendable liquid crystal display (LCD) keyswitch to a controlling processor. The interface circuit is adaptable for use with data input devices and point-of-sale devices.
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 November 7, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 7, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 7, 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.
FiledNovember 7, 1994
GrantedNo grant recorded
Term endedNovember 7, 2014
Patent numberCA 2175682 A1
Classification (IPC)G06F3/02 +1 more
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.