Method for monitoring degradation of lubricating oils

Details Method for monitoring degradation of lubricating oils Method for monitoring degradation of lubricating oils

2005-11-08

2009-12-22

Siefke, Sam P (Department: 1797)

Chemistry: analytical and immunological testing

Optical result

Including reagent preparation

C508S110000, C208S428000, C507S907000

Reexamination Certificate

active

07635596

ABSTRACT:
A method for monitoring degradation of lubricating oils. The method comprises steps of: (a) adding to a lubricating oil at least one compound having formula (I)wherein R1and R2independently are hydrogen, hydroxy, OR11, amino or NR11R12; R3and R5independently are alkyl, aryl, aralkyl, heteroalkyl or heterocyclic; R4and R6independently are hydrogen or alkyl; R7, R8, R9and R10independently are cyano, nitro, amide, carboxyl, ester, alkyl or hydrogen; R11is alkyl, aryl, aralkyl, heteroalkyl, heterocyclic or alkanoyl; R12is hydrogen or alkyl; provided that said at least one compound of formula (I) has at least one substituent selected from among cyano, nitro, hydroxy, hydroxyalkyl, amide, carboxyl, ester and unsaturated alkyl; and (b) measuring a spectroscopic property of the oil to determine degradation of said at least one compound.

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