Contact lens purification system
CA 2089887 C · Owner: Burris, William Alan · Inventors: Burris, William Alan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Contact lenses are purified by contact with ozone in a compact system that includes an ozone generator (15) a purifying, liquid in a lens chamber (20) and a pumping system (23) for flowing liquid and gas in a way that brings ozone dissolved in a purifying liquid into contact with the lenses (30). In some embodiments undissolved ozone can also contact the lenses (30). Several preferred arrangements are shown for accomplishing the lens purification with such an ozone disinfection system having features such as a hydrophobic element (12) for isolation liquid from the generator (15) a timer (48) or an arrangement (40) to vent excess ozone from the generator (15).
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 August 7, 1991 and granted May 27, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 7, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 7, 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.