US1639852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for sinking and cleaning oil and water wells
Assignee: Individual
•
Filing: 1927-01-24
•
Granted: 1927-08-23
•
Expires: 1947-01-24
Abstract
No abstract record available.
Inventors
- 👤 Milford A King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:35
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/01; E21B33/00; E21B33/02; E21B33/03; E21B33/04; E21B49/00; E21B49/005
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) | 1930-08-22 | 1931-02-21 | 1931-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-08-22 | 1935-02-21 | 1935-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-08-22 | 1939-02-21 | 1939-08-23 | $7700.00 | Window Closed / Lapsed |