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CA 2203481 C · Owner: Spoto, Louis M. · Inventors: Spoto, Louis M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus is provided for giving a visual indication of increments of position over a predetermined range of positions to either side of and including a predetermined zero reference point. The apparatus includes a plurality of pattern generating units, each including first and second surfaces each of these, first and second surfaces having a plurality of spaced-apart opaque areas having translucent areas therebetween. The second surface is superimposed upon the first surface for creating a plurality of patterns in response to movement therebetween. The plurality of pattern generating units are arranged adjacent one another and are respectively configured for producing a unique and …
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 23, 1997 and granted August 6, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 23, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 2019.
- 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.