Precursor organic solutions of tetravalent metal phosphates and pyrophosphates and their use for electrode modification and for the preparation of composite membrane for fuel cells working at temperatures >90.degree.c and/or at low relative humidity
CA 2563567 C · Owner: Alberti, Giulio · Inventors: Tarpanelli, Tiziano; Alberti, Giulio; Pica, Monica
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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The invention is based on the preparation of precursor organic solutions of tetravalent metal phosphates and pyrophosphates with composition M(IV)(O3P- OH)2, M(IV)O2P(OH)22O2PO(OH) and M(IV)P2O7 (M= Zr Hf, Ti). An important , property of these solutions is that the said compounds are formed when the solvent is evaporated. This peculiarity allows an easy insertion of the compounds inside the pores of porous membranes in polymeric membranes and in , the electrodic interfaces of fuel cells. The acid properties of their surfaces, the high thermal stability and the insolubility in water make these particles extremely of interest for improving the efficiency of PEMFCs in the temperature …
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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 August 18, 2004 and granted October 9, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 18, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 18, 2026.
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