Optical angular encoder
CA 2503148 A1 · Owner: Berthou, Nicolas · Inventors: Berthou, Nicolas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a method for controlling the reliability of data supplied by a dual optical angular encoder comprising two pairs of cells (C1 C2, C'1, C'2) for detecting marks borne by a disc (12) which consists in: comparing at a given time the sequences of at least four successive states taken from the two groups of cells prior to said time and validating the incrementation or decrementation indications given by the two groups if the sequence for one group is either identical or phase-shifted by at least one state ahead or behind, relative to the sequence of the other group.
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 21, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 21, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 21, 2025.
- 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.