US1923015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Advancing motor drilling structure
Assignee: Individual
•
Filing: 1931-02-03
•
Granted: 1933-08-15
•
Expires: 1951-02-03
Abstract
No abstract record available.
Inventors
- 👤 Sandstone Harvey David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:35
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/04; E21B33/00; E21B33/10; E21B33/13; E21B33/138
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) | 1936-08-14 | 1937-02-13 | 1937-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-08-14 | 1941-02-13 | 1941-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-08-14 | 1945-02-13 | 1945-08-15 | $7700.00 | Window Closed / Lapsed |