Pointing device utilizing a photodetector array
CA 2107743 A1 · Owner: Logitech, Inc. · Inventors: Bussien, Aldo; Bidiville, Marc; Arreguit, Javier
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cursor control device for personal computers and workstations includes a randomly speckled ball illuminated with diffuse lighting. An image of at leasta portion of the illuminated area of the speckled ball is focused by an optical element such as a diffractive optical element onto a photosensitive array. Logicassociated with the photosensitive array determines movement of the ball across the array, and translates that movement into conventional cursor control signalssupplied to a host system.
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 5, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 5, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 5, 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.