Chemistry: analytical and immunological testing – Heterocyclic carbon compound – Hetero-n
Reexamination Certificate
2003-10-15
2010-10-26
Alexander, Lyle A (Department: 1797)
Chemistry: analytical and immunological testing
Heterocyclic carbon compound
Hetero-n
C422S051000, C422S051000, C422S051000, C436S169000, C435S287900
Reexamination Certificate
active
07820449
ABSTRACT:
The present invention provides a novel test piece for creatinine measurement. The test piece includes a compound expressed by the following formula (1), a metal that forms a colored complex with the compound, and a buffer agent in a porous material. The amount of creatinine is determined by optically measuring a colored complex of the compound and the metal and evaluating the degree of inhibition of the colored complex formation by creatinine. In the formula (1), R1represents H, SO3X, or COOX. R4and R6represent OH, SO3X, or COOX and may be either the same or different. R2, R3, R5, and R7represent H, OH, Cl, Br, I, NO2, NO, or CH3and may be either the same or different. Xs in the R1, R4, and R6represent H, Na, K, or NH4and may be either the same or different.
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Alexander Lyle A
ARKRAY, Inc.
Hamre Schumann Mueller & Larson P.C.
White Dennis M
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