Chemistry: analytical and immunological testing – Geochemical – geological – or geothermal exploration – Using chemical tracers
Reexamination Certificate
2011-03-29
2011-03-29
Menon, Krishnan S (Department: 1777)
Chemistry: analytical and immunological testing
Geochemical, geological, or geothermal exploration
Using chemical tracers
C044S437000, C508S545000
Reexamination Certificate
active
07915048
ABSTRACT:
A method for marking a liquid petroleum hydrocarbon. The method comprises adding to the liquid petroleum hydrocarbon at least one substituted anthraquinone dry having formula (I)wherein X is O or S; Y is O, NR7or S; R1and R2independently are hydrogen, alkyl, aryl, aralkyl, heteroalkyl, heterocyclic or alkanoyl; R3and R5independently are alkyl, aryl, aralkyl, heteroalkyl or heterocyclic; R4and R6independently are hydrogen or alkyl; R7is hydrogen or alkyl; and wherein the substituted anthraquinone dye(s) has an absorption maximum in the range from 600 nm to 750 nm.
REFERENCES:
patent: 2611772 (1952-09-01), Allen et al.
patent: 2727045 (1955-12-01), McSheahy
patent: 3164449 (1965-01-01), Buxbaum et al.
patent: 4138415 (1979-02-01), Murdock et al.
patent: 4197249 (1980-04-01), Murdock et al.
patent: 4455253 (1984-06-01), Thompson
patent: 4755012 (1988-07-01), Kojima
patent: 5139330 (1992-08-01), Niizawa et al.
patent: 5342974 (1994-08-01), Ohyama et al.
patent: 5525516 (1996-06-01), Krutak et al.
patent: 5663386 (1997-09-01), Raulfs et al.
patent: 5804447 (1998-09-01), Albert et al.
patent: 5880287 (1999-03-01), Dandliker et al.
patent: 6274381 (2001-08-01), Pauls et al.
patent: 6312958 (2001-11-01), Meyer et al.
patent: 2003/0126694 (2003-07-01), Ho et al.
patent: 2004/0106526 (2004-06-01), Baxter et al.
patent: 1 532 812 (1975-04-01), None
patent: 1 527 383 (1976-06-01), None
patent: 0 201 368 (1986-03-01), None
patent: 2000263953 (2000-09-01), None
U.S. Appl. No. 10/854,046, filed May 26, 2004, Ho et al.
Baxter David Roderick
Cranmer Peter John
Ho Kim Sang
Crimaldi Kenneth
Fritchman Rebecca
Menon Krishnan S
Rohm and Haas Company
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