US2856155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary drilling apparatus
Assignee: VALLEY WHITE TRUCK Co WYO
•
Filing: 1955-07-12
•
Granted: 1958-10-14
•
Expires: 1975-07-12
Abstract
No abstract record available.
Inventors
- 👤 Joseph W Putt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:46
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B7/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1375640A
Cited
US1397324A
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US1571077A
Cited
US2415572A
Cited
US2528588A
Cited
US2665116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |