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Patent US2831347A successfully refreshed from Google Patents.
US2831347A
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Apparatus for recording drilling operations
Assignee: DRILLOGRAPH CO Inc
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Filing: 1954-08-23
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Granted: 1958-04-22
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Expires: 1974-08-23
Abstract
No abstract record available.
Inventors
- 👤 Jesse E Yancey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:46
CPC Classifications
E; E21; E21B; E21B45/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190121895A
Cited
US1284521A
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US2287819A
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US2688249A
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US2612430A
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US2679161A
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US2600336A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |