US3525404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary drilling rig with direct power drive and simplified controls
Assignee: Hughes Tool Co
•
Filing: 1968-02-23
•
Granted: 1970-08-25
•
Expires: 1988-02-23
Abstract
No abstract record available.
Inventors
- 👤 Elmer F Newman
- 👤 Hollis H Travis
- 👤 Ross Mckee
- 👤 Joseph L Kelly Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:13
CPC Classifications
E; E21; E21B; E21B3/00; E21B3/02; E21B19/00; E21B19/08; E21B19/086; E21B44/00; E21B44/02; E21B44/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-24 | 1974-02-23 | 1974-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-24 | 1978-02-23 | 1978-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-24 | 1982-02-23 | 1982-08-25 | $7700.00 | Window Closed / Lapsed |