Patent US4729839 - Thio ester-ethers, esterification, etherification - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More ??Sign inAdvanced Patent SearchPatentsA method for preparing a water soluble lubricating additive having the generic structural formula: ##STR1## wherein R1 is an alkyl, cycloalkyl, aryl, alkaryl or aralkyl group having from 1 to 34 carbon atoms; R2, R3 and R4