Mouse with slip and rotation compensation
CA 2040400 A1 · Owner: Graham, Stephen J. · Inventors: Nelson, Anthony B.; Graham, Stephen J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A mouse for use with a computer for tracing and digitizing traces on a two dimensional surface has slip and rotation compensation. A second ball is provided with a least one counter capable of encoding X and Y direction movement of the mouse. A first ball includes an X direction counter and a Y direction counter. Appropriate software or hardware compensates for most slip and rotation from discrepancies between the X, Y direction motion of the second ball and the X, Y direction motion of the first ball. Slip and rotation discrepancies between the two balls may be accounted for. In another embodiment a, third ball with a least one counter provides additional information to account 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 April 15, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 15, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 15, 2013.
- 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.