prov:value
| - Some specific, but not limiting examples are the salts of the acids described in U.S. Pat. No. 2,559,752 of the formula X(CF2)nCOOM, wherein X is hydrogen or fluorine, M is an alkali metal, ammonium, substituted ammonium (e.g., alkylamine of 1 to 4 carbon atoms), or quaternary ammonium ion, and n is an integer from 6 to 20; sulfuric acid esters of polyfluoroalkanols of the formula X(CF2)nCH2OSO3M,
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