Flexible digitizer tablet
CA 2109615 C · Owner: Calcomp Inc. · Inventors: Doubrava, Dana; Long, Gary R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This is a flexible digitizer tablet (12") for sensing the position of a cursor coil (20) radiating a magnetic field therefrom and thereby a cursor (14) carrying the cursor coil (20) without signal interference and distortion adjacent edges of an active area of the table (12"). There is a bottom layer (28') of a flexible insulating material a grid of wires (30') on a flexible substrate comprising the active area of the tablet (12") and a shunt layer (34) of a flexible metal foil disposed between the substrate carrying the grid of wires and the bottom layer (28').
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 March 10, 1992 and granted March 18, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 10, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 10, 2014.
- 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.