Fluid purification
CA 2095243 C · Owner: Henderson, Robert B. · Inventors: Al-Ekabi, Hussain; Henderson, Robert B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of removing, reducing, or detoxifying organic pollutants from a fluid, water or air, by, contacting the fluid with a photo-reactive metal semiconductor, material in the presence of ultraviolet light of a wavelength to activate the, photoreactive material is improved, by simultaneously contacting the photoreactive material with a, substance that accepts electrons and thus inhibits hole-electron recombination. Such substance will be such as to readily accept electrons either, from the conduction band or from superoxide ions, and to rapidly, dissociate into harmless products.
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 December 5, 1991 and granted May 18, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 5, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 5, 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.