US1697086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow drill steel
Assignee: Individual
•
Filing: 1927-04-29
•
Granted: 1929-01-01
•
Expires: 1947-04-29
Abstract
No abstract record available.
Inventors
- 👤 Pryce Leslie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:33
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/36; Y; Y10; Y10S; Y10S76/00; Y10S76/04; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/1275; Y10T428/12757
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) | 1932-01-01 | 1932-07-02 | 1933-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-01-01 | 1936-07-02 | 1937-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-01-01 | 1940-07-02 | 1941-01-01 | $7700.00 | Window Closed / Lapsed |