Improved on demand useful life indicator and method of making same
CA 2240912 A1 · Owner: Gill, Peter L. · Inventors: Ramsey, Joseph W.; Gill, Peter L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An on demand useful life indicator 10 and method providing a uniform visual change. The indicator 10 is attachable to goods or may be worn. This indicator includes a base 12; indicator material 14 impermeable, adhesive 16, and a co-layered covering 18. The indicator material 14 provides a visual indication when exposed to a selected component of an ambient fluid. The indicator material 14 is intimately fixed to one side of a second layer 22 of the covering 18 in a selected pattern. The adhesive layer 16 is applied in a selected pattern between the base member 12 and the covering material 18. A permeable second layer 22 of the covering 18 is adhered to the adhesive layer 16 allowing an …
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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 June 17, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 17, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 17, 2020.
- 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.