Patent US2227233A successfully refreshed from Google Patents.
US2227233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directional drilling apparatus
Assignee: Reed Roller Bit Co
•
Filing: 1939-04-06
•
Granted: 1940-12-31
•
Expires: 1959-04-06
Abstract
No abstract record available.
Inventors
- 👤 George L Scott
- 👤 John F Shaw
- 👤 Wiley B Noble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:45
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/06; E21B7/064
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-12-31 | 1944-07-01 | 1944-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-12-31 | 1948-07-01 | 1948-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-12-31 | 1952-07-01 | 1952-12-31 | $7700.00 | Window Closed / Lapsed |