Patent US2379138A successfully refreshed from Google Patents.
US2379138A
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Annular flow measuring device
Assignee: Shell Development Co
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Filing: 1943-01-11
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Granted: 1945-06-26
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Expires: 1963-01-11
Abstract
No abstract record available.
Inventors
- 👤 Jr Ralph U Fitting
- 👤 Mark H Mckinsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:52
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/10; E; E21; E21B; E21B47/00; E21B47/10; E21B47/107; G01F1/106
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-06-25 | 1948-12-25 | 1949-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-06-25 | 1952-12-25 | 1953-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-06-25 | 1956-12-25 | 1957-06-26 | $7700.00 | Window Closed / Lapsed |