Patent US2713261A successfully refreshed from Google Patents.
US2713261A
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Self-contained flowmeter
Assignee: Sperry Sun Well Surveying Co
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Filing: 1951-10-02
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Granted: 1955-07-19
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Expires: 1971-10-02
Abstract
No abstract record available.
Inventors
- 👤 Gilbert J Butterworth
- 👤 Stephen W Gurasich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:23
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/10; E; E21; E21B; E21B47/00; E21B47/10; G01F1/115; G01F1/1155
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US501203A
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FR615298A
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US697492A
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US1521969A
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US1696600A
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FR31602E
Cited
US2143962A
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US2334920A
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US2529481A
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US2593285A
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US2524150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-07-18 | 1959-01-17 | 1959-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-07-18 | 1963-01-17 | 1963-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-07-18 | 1967-01-17 | 1967-07-19 | $7700.00 | Window Closed / Lapsed |