US2689171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Identifying gasoline and the like
Assignee: United States Department of the Army
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Filing: 1949-12-08
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Granted: 1954-09-14
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Expires: 1969-12-08
Abstract
No abstract record available.
Inventors
- 👤 Karl F Hager
- 👤 Rosenthal Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:12
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; Y; Y10; Y10T; Y10T436/00; Y10T436/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
THE METHOD OF IDENTIFYING AN ALIPHATIC HYDROCARBON LIQUID SECRETLY MARKED BY DISSOLVING THEREIN BETWEEN ABOUT 0.001% AND 0.01% BY WEIGHT OF AN AROMATIC DIAZOTIZABLE AMINE WHICH COMPRISES EXTRACTING SAID LIQUID WITH AN AQUEOUS ACID SOLUTION, ADDING SODIUM NITRITE TO THE EXTRACTED SOLUTION TO DIAZOTIZE THE AMINE, BUFFERING WITH SODIUM ACETATE AND REACTING THE NITRITECONTAINING SOLUTION WITH A COUPLING COMPONENT TO FORM AN AZO DYE.
Claim 2
Independent Claim
64 words
THE METHOD OF IDENTIFYING AN ALIPHATIC HYDROCARBON LIQUID SECRETLY MARKED BY DISSOLVING THEREIN BETWEEN ABOUT 0.001% AND 0.01% BY WEIGHT OF AN AROMATIC DIAZOTIZABLE AMINE WHICH COMPRISES EXTRACTING SAID LIQUID WITH AN AQUEOUS ACID SOLUTION, ADDING SODIUM NITRITE TO THE EXTRACTED SOLUTION TO DIAZOTIZE THE AMINE, BUFFERING WITH SODIUM ACETATE AND REACTING THE NITRITECONTAINING SOLUTION WITH A COUPLING COMPONENT TO FORM AN AZO DYE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |