US2972679A
Expired / Lapsed
US
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Methods of determining the dimensions of underground cavities
Assignee: ExxonMobil Oil Corp
•
Filing: 1958-06-19
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Granted: 1961-02-21
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Expires: 1978-06-19
Abstract
No abstract record available.
Inventors
- 👤 Richard L Caldwell
- 👤 Robert F Sippel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:20
CPC Classifications
G; G01; G01F; G01F17/00; E; E21; E21B; E21B47/00; E21B47/003; E21B47/04; E21B47/047; E21B47/08; E21B47/085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-21 | 1964-08-22 | 1965-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-21 | 1968-08-22 | 1969-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-21 | 1972-08-22 | 1973-02-21 | $7700.00 | Window Closed / Lapsed |