US4735631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colored petroleum markers
Assignee: ATK Launch Systems LLC
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Filing: 1986-10-16
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Granted: 1988-04-05
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Expires: 2006-10-16
Abstract
Abstract Tagging compounds (which function as both dyes and markers) having the following structures: ##STR1## wherein x is an integer between 0 and 3 inclusive, y is an integer between 1 and 3 inclusive, z is 0 or 1, and R is a straight or branched chain hydrocarbon are disclosed. These compounds can be dissolved in a diluent at a concentration of from about 10 percent to about 30 percent, forming a concentrate which can be further dispersed in an organic liquid to form a final concentration of from about 1 ppm to about 15 ppm of said tagging compound in said liquid. Methods for detecting the presence of a tagged compound in an organic liquid are also disclosed.
Inventors
- 👤 Richard B. Orelup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:59
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/003; C09; C09B; C09B1/00; C09B1/50; C09B1/51; C09B1/515; C10L1/10; C10L1/14; C10L1/22; C10L1/222; C10L1/223; C10L1/2235
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
78 words
A method for marking water-immiscible fuel so the presence of the marker can be verified, comprising the steps of: A. providing a water-immiscible fuel to be marked; B. providing a marker having the structure: ##STR5## where x is an integer between 0 and 3 inclusive, y is an integer between 1 and 3 inclusive, and z is 0 or 1; and C. stably dispersing from about 1 ppm to about 15 ppm of said marker in said fuel.
Claim 2
Independent Claim
78 words
A method for marking water-immiscible fuel so the presence of the marker can be verified, comprising the steps of: A. providing a water-immiscible fuel to be marked; B. providing a marker having the structure: ##STR5## where x is an integer between 0 and 3 inclusive, y is an integer between 1 and 3 inclusive, and z is 0 or 1; and C. stably dispersing from about 1 ppm to about 15 ppm of said marker in said fuel.
Claim 3
Dependent Claim
46 words
The method of claim 1, wherein said dispersing step is performed by dispersing from about 100,000 to about 300,000 ppm of said marker in a diluent liquid which is soluble in said fuel, thereby forming a marking solution, then dispersing said marking solution in said fuel.
Claim 4
Dependent Claim
23 words
The method of claim 2, wherein said diluent liquid is selected from methyl naphthalenes, xylene, xylenols, ortho-sec-butyl phenol, para-nonyl phenol, and mixtures thereof.
Claim 5
Dependent Claim
17 words
The method of claim 1, wherein said water-immiscible fuel contains more than about 30% cracked fuel oil.
Claim 6
Dependent Claim
15 words
The method of claim 1, wherein said water-immiscible fuel contains about 25% cracked fuel oil.
Claim 7
Dependent Claim
17 words
The method of claim 1, wherein x is selected from 0 or 1 and y is 2.
Claim 8
Dependent Claim
10 words
The method of claim 1, wherein said marker is 2-(methoxypropylamino)-1,4-dihydroxyanthraquinone.
Claim 9
Dependent Claim
10 words
The method of claim 1, wherein said marker is 2-(methoxy-ethoxypropylamino)-1,4-dihydroxyanthraquinone.
Claim 10
Dependent Claim
15 words
The method of claim 1, wherein said marker is a mixture of 2-(methoxypropylamino)-1,4-dihydroxyanthraquinone and 2-(methoxy-ethoxypropylamino-1,4-dihydroxyanthraquinone.
References Cited (Backward Citations)
US1898953A
Cited
US3164449A
Cited
FR1306040A
Cited
US3764273A
Cited
US3883568A
Cited
CA1016941A
Cited
GB1549873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-05 | 1991-10-05 | 1992-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-05 | 1995-10-05 | 1996-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-05 | 1999-10-05 | 2000-04-05 | $7700.00 | Window Closed / Lapsed |