Residual life indicator
CA 2462911 A1 · Owner: Bennett, Mindy R. · Inventors: Ericsson, Amber J.; Roehl, Joseph E.; Greenfield, Mark J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed toward a residual life indicator. The residual life indicator comprises a solid surface active, waterproof support , medium (20) having a concentric pattern (30) imprinted thereon. The concentric pattern comprises a center pattern (40) and at least one outer pattern (50). An indicator dye spot (60) is disposed within the center pattern of the concentric patter. When the indicator dye is exposed to contaminants the , indicator dye spot visually moves toward the outer pattern.
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 September 30, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 30, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 30, 2024.
- 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.