US Patent Issued to PRAXAIR S.T. TECHNOLOGY on Feb. 10 for "Chromate-free and phosphate-free ceramic coating compositions for hot corrosion protection of substrates" (Indiana Inventors)

ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,545,791, issued on Feb. 10, was assigned to PRAXAIR S.T. TECHNOLOGY INC. (North Haven, Conn.).

"Chromate-free and phosphate-free ceramic coating compositions for hot corrosion protection of substrates" was invented by Zhihong Tang (Carmel, Ind.), Daryl G. Copeland (Indianapolis) and Mark W. Perpall (Indianapolis).

According to the abstract* released by the U.S. Patent & Trademark Office: "Novel multilayer aqueous slurries and coatings for hot corrosion protection of substrates are provided that exhibit improved resistance to type II hot corrosion while also being hexavalent chromium free. The compositions represent a notable departure and performance improvement from conventional coa...