Optical readers
CA 2097360 A1 · Owner: Dvorkis, Paul · Inventors: Thomas, Ralph; Fuller, Robert; Goldner, Leonard H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure To read optically encoded information over a wide range of densities, the present invention provides a spacer system on the tip of an optical reader. The optical reader may be a contact wand type device for, example including a fixed laser emitter. Alternatively the optical reader may be a moving spot scanner. In either case, the emitter element of the optical reader produces a diverging beam of light. During a reading operation the spacer contacts the, object surface on which optically encoded indicia is formed. The spacer selectively defines at least two different distances between the light emitter or the, focal point of the emitted beam of light and the, …
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 May 31, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 31, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 31, 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.