US3716426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixture of a radioactive tracer substance and a propellent for marking drilling tools for deep wells and similar boreholes
Assignee: Hoechst AG
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Filing: 1969-06-02
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Granted: 1973-02-13
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Expires: 1989-06-02
Abstract
Abstract For the expulsion of radioactive indicators from tracer cavities in drilling tools for deep wells and similar boreholes propellants are used which do not react with the water of the circulating drilling fluid in stoichiometric proportions. The propellents consist of a mixture of aluminum powder and an alkali metal peroxide as the primer and an explosive as the gas-yielding component. Ammonium picrate may be used with special advantage as the gas-yielding component.
Inventors
- 👤 H Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:05
CPC Classifications
C; C06; C06B; C06B33/00; C06B23/00; C06B23/008; C06B25/00; C06B25/04; C06C; C06C7/00; Y; Y10; Y10S; Y10S507/00; Y10S507/907
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
In a composition of matter adaptable to use for indicating wear in drilling tools, said composition consisting essentially of a mixture of a radioactive tracer, ammonium picrate, and a water-activated primer for said ammonium picrate, the improvement wherein said primer is a mixture of finely-divided aluminum and an alkali metal peroxide.
Claim 2
Dependent Claim
51 words
In a composition of matter adaptable to use for indicating wear in drilling tools, said composition consisting essentially of a mixture of a radioactive tracer, ammonium picrate, and a water-activated primer for said ammonium picrate, the improvement wherein said primer is a mixture of finely-divided aluminum and an alkali metal peroxide.
References Cited (Backward Citations)
US2995526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |