US2814464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air course drill bits
Assignee: ENGINEERING LAB Inc
•
Filing: 1953-01-02
•
Granted: 1957-11-26
•
Expires: 1973-01-02
Abstract
No abstract record available.
Inventors
- 👤 Carl M Pike
- 👤 Constantine M Xeros
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:47
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; E21B10/23
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1302967A
Cited
US1306371A
Cited
US1254267A
Cited
US1334632A
Cited
US1838045A
Cited
US1537551A
Cited
US1902941A
Cited
US1784476A
Cited
US1816203A
Cited
US1945240A
Cited
US2087500A
Cited
US2063012A
Cited
US2122758A
Cited
US2329745A
Cited
US2661932A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-25 | 1961-05-27 | 1961-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-25 | 1965-05-27 | 1965-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-25 | 1969-05-27 | 1969-11-26 | $7700.00 | Window Closed / Lapsed |