US2799477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansible drill bits
Assignee: Rotary Oil Tool Co
•
Filing: 1953-09-21
•
Granted: 1957-07-16
•
Expires: 1973-09-21
Abstract
No abstract record available.
Inventors
- 👤 Jr Archer W Kammerer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:29
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/26; E21B10/32; E21B10/34
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1774763A
Cited
US1881035A
Cited
US2545032A
Cited
US2545036A
Cited
US2545037A
Cited
US2654576A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-15 | 1961-01-14 | 1961-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-15 | 1965-01-14 | 1965-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-15 | 1969-01-14 | 1969-07-16 | $7700.00 | Window Closed / Lapsed |