Xanthenes as fuel markers
US11149222B2 · kind B2 · utility
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21References
7Claims
0Family size
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Key dates
| Filing date | Mar 25, 2019 |
| Grant date | Oct 19, 2021 |
| Priority date | — |
| Expiry date | Mar 25, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10L2230/16
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for marking a petroleum hydrocarbon or a liquid biologically derived fuel; said method comprising adding to said petroleum hydrocarbon or liquid biologically derived fuel at least one compound that is a R1, R2, R3, R4, R5, R6, R7, R8, R9 and R10-substituted xanthene, wherein R1, R2, R3, R4, R5, R6, R7, R8, R9 and R10 independently are hydrogen, hydrocarbyl, hydrocarbyloxy, aryl or aryloxy; wherein each compound of formula (I) is present at a level from 0.01 ppm to 20 ppm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.