US3480092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary impact burrowing device
Assignee: AT&T Inc
•
Filing: 1967-11-08
•
Granted: 1969-11-25
•
Expires: 1987-11-08
Abstract
No abstract record available.
Inventors
- 👤 Gordon A Reinold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:51
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/26
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2540161A
Cited
US2650314A
Cited
US2864633A
Cited
US2999572A
Cited
US3326008A
Cited
US3330368A
Cited
US3375885A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-24 | 1973-05-26 | 1973-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-24 | 1977-05-26 | 1977-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-24 | 1981-05-26 | 1981-11-25 | $7700.00 | Window Closed / Lapsed |