Apparatus and method for disinfecting a contact lens and detecting the presence of an oxidative disinfectant
CA 2091578 C · Owner: Allergan, Inc. · Inventors: Amtower, Patricia C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus and method useful for disinfecting a contact lens are disclosed. The apparatus includes a color indicator element comprising a redox polymer containing a repeating unit which has a stable oxidized slats and a stable reduced state. This color indicator element provides a color indication of the presence of the oxidative disinfectant; e.g. hydrogen peroxide in the, liquid medium.
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 10, 1991 and granted March 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 10, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 10, 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.