Patent US2419371A successfully refreshed from Google Patents.
US2419371A
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US
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Assignee: Individual
•
Filing: 1941-07-23
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Granted: 1947-04-22
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Expires: 1961-07-23
Abstract
No abstract record available.
Inventors
- 👤 Schlumberger Marcel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:05
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/116; E21B43/1185
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1552273A
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US2099993A
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US2141827A
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US2313030A
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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) | 1950-04-21 | 1950-10-21 | 1951-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-04-21 | 1954-10-21 | 1955-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-04-21 | 1958-10-21 | 1959-04-22 | $7700.00 | Window Closed / Lapsed |