US2451797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing pressure pulses in boreholes
Assignee: Schlumberger Well Surveying Corp
•
Filing: 1945-02-17
•
Granted: 1948-10-19
•
Expires: 1965-02-17
Abstract
No abstract record available.
Inventors
- 👤 Blanchard Andre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:51
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/26; G01V3/265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US636519A
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US935750A
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US942897A
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US1097859A
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US1604693A
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US1518123A
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US1526414A
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US1577741A
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US1872946A
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GB311327A
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FR704486A
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US2405225A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-19 | 1952-04-19 | 1952-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-19 | 1956-04-19 | 1956-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-19 | 1960-04-19 | 1960-10-19 | $7700.00 | Window Closed / Lapsed |