US2491445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flowmeter
Assignee: Shell Development Co
•
Filing: 1947-02-24
•
Granted: 1949-12-13
•
Expires: 1967-02-24
Abstract
No abstract record available.
Inventors
- 👤 Cunningham James Jay
- 👤 Johnston Robert William Beggs
- 👤 Phillips Ross Elton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:22
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/56; G01F1/64
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) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |