Changing-advertisement display
CA 2089757 A1 · Owner: Stierle, Georg · Inventors: Stierle, Georg
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The changing-advertisement display disclosed has a carrier band which can be unrolled in a first direction from a first roller on to a second roller or in a second direction from the second roller on to the first roller. Advertisements are attached at pre-determined positions to the carrier band the positions being, indicated by means of marks which can be detected by a sensor to produce position signals for the movement of the carrier band. A specially controlled roller drive enables the carrier band to be moved at a constant speed between the rollers over it whole length in both directions and held taut at all times.
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 July 31, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 31, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 31, 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.