US1388490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary earth-boring drill
Assignee: Individual
•
Filing: 1920-09-18
•
Granted: 1921-08-23
•
Expires: 1940-09-18
Abstract
No abstract record available.
Inventors
- 👤 John R Suman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:51
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/62; E21B10/46; E21B10/56; E21B10/60; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17931
Claims Analysis
Total Claims: 0
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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) | 1924-08-22 | 1925-02-21 | 1925-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-08-22 | 1929-02-21 | 1929-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-08-22 | 1933-02-21 | 1933-08-23 | $7700.00 | Window Closed / Lapsed |