Use of green porphyrins in ocular diagnosis and therapy
CA 2185644 C · Owner: Young, Lucy H.Y. · Inventors: Gragoudas, Evangelos S.; Miller, Joan W.; Schmidt-Erfurth, Ursula
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Photodynamic therapy of conditions of the eye characterized by unwanted neovasculature such as macular degeneration, is effective using green porphyrins as photoactive agents. Green porphyrins are also effective in photodynamic therapy of pigmented tumors of the eye. In addition green porphyrins serve as effective dyes in ocular angiography.
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 March 14, 1994 and granted April 12, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 14, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 14, 2016.
- 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.