Patent US2820610A successfully refreshed from Google Patents.
US2820610A
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Multiple magnetization device for well cores
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1955-08-03
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Granted: 1958-01-21
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Expires: 1975-08-03
Abstract
No abstract record available.
Inventors
- 👤 Joseph D Martinez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:51
CPC Classifications
E; E21; E21B; E21B25/00; E21B25/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2735652A
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US1891628A
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US2119783A
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US2140097A
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US2292838A
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US2203730A
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US2583814A
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US2709069A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |