The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 20, 2005
Filed:
May. 26, 2004
Kim Sang Ho, Richboro, PA (US);
David Roderick Baxter, Mirfield, GB;
Kim Sang Ho, Richboro, PA (US);
David Roderick Baxter, Mirfield, GB;
Rohm and Haas Company, Philadelphia, PA (US);
Abstract
A method for marking a liquid petroleum hydrocarbon. The method comprises adding to the liquid petroleum hydrocarbon at least one substituted anthraquinone dye having formula (I)wherein Rand Rindependently are hydrogen, hydroxy, OR, amino or NRR; Rand Rindependently are alkyl, aryl, aralkyl, heteroalkyl or heterocyclic; Rand Rindependently are hydrogen or alkyl; R, R, Rand Rindependently are cyano, nitro or hydrogen, provided that at least two of R, R, Rand Rare cyano or nitro; Ris alkyl, aryl, aralkyl, heteroalkyl, heterocyclic or alkanoyl; Ris hydrogen or alkyl; and wherein the substituted anthraquinone dye(s) has an absorption maximum in the range from 690 nm to 1000 nm.