US2810547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Installation for making a borehole in a stratum
Assignee: AG fur GRUNDWASSERBAUTEN
•
Filing: 1954-02-24
•
Granted: 1957-10-22
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Expires: 1974-02-24
Abstract
No abstract record available.
Inventors
- 👤 Fehlmann Hans Beat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:23
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/046
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US65801A
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US140173A
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FR545319A
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US1179491A
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US2143848A
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US2274431A
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US2383496A
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US2397755A
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US2419711A
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US2570039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-21 | 1961-04-22 | 1961-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-21 | 1965-04-22 | 1965-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-21 | 1969-04-22 | 1969-10-22 | $7700.00 | Window Closed / Lapsed |