US2593285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil well flowmeter
Assignee: Shell Development Co
•
Filing: 1948-04-26
•
Granted: 1952-04-15
•
Expires: 1968-04-26
Abstract
No abstract record available.
Inventors
- 👤 Charles H Fay
- 👤 Stephenson Maurice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:18
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/10; G; G01; G01F; G01F1/00; G01F1/05; G01F1/10; G01F1/115; G01F1/1155
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US864579A
Cited
US1652472A
Cited
US1963904A
Cited
US2120991A
Cited
US2334920A
Cited
US2379138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-15 | 1955-10-15 | 1956-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-15 | 1959-10-15 | 1960-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-15 | 1963-10-15 | 1964-04-15 | $7700.00 | Window Closed / Lapsed |