Patent US3038546A successfully refreshed from Google Patents.
US3038546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Horizontal earth boring apparatus
Assignee: Individual
•
Filing: 1960-01-15
•
Granted: 1962-06-12
•
Expires: 1980-01-15
Abstract
No abstract record available.
Inventors
- 👤 Robert L Blubaugh
- 👤 David L Lindsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:58
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/003; E21B7/04; E21B7/046
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1861038A
Cited
US2054254A
Cited
US2005978A
Cited
US2325565A
Cited
US2517494A
Cited
US2529246A
Cited
US2656128A
Cited
US2682120A
Cited
CH322910A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-06-11 | 1965-12-11 | 1966-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-11 | 1969-12-11 | 1970-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-11 | 1973-12-11 | 1974-06-12 | $7700.00 | Window Closed / Lapsed |