US2501598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic method of pipe-line inspection
Assignee: Shell Development Co
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Filing: 1947-07-28
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Granted: 1950-03-21
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Expires: 1967-07-28
Abstract
No abstract record available.
Inventors
- 👤 George C Eltenton
- 👤 Marvin B Fallgatter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:39
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/08; G01V3/082; F; F16; F16L; F16L2101/00; F16L2101/30
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) | 1953-03-20 | 1953-09-19 | 1954-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-20 | 1957-09-19 | 1958-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-20 | 1961-09-19 | 1962-03-21 | $7700.00 | Window Closed / Lapsed |