Method for marking hydrocarbons with anthraquinones
US6811575B2 · kind B2 · utility
9Cited by
16References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 3, 2002 |
| Grant date | Nov 2, 2004 |
| Priority date | — |
| Expiry date | Apr 21, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/13
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Method for invisibly marking a liquid petroleum hydrocarbon. The method comprises adding to the liquid petroleum hydrocarbon at least one dye selected from the group consisting of 1,4,5,8-tetrasubstituted anthraquinones and anthraquinone dimers. The absorption maximum of the dye(s) is in the range from 710 nm to 850 nm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.