US1586923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well-drilling equipment
Assignee: Individual
•
Filing: 1924-02-18
•
Granted: 1926-06-01
•
Expires: 1944-02-18
Abstract
No abstract record available.
Inventors
- 👤 Elvin E Townsend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:20
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; Y; Y10; Y10T; Y10T137/00; Y10T137/598; Y10T137/612; Y10T137/613; Y10T24/00; Y10T24/44; Y10T24/44068; Y10T24/44291; Y10T24/44342; Y10T24/4435; Y10T24/44359
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) | 1929-05-31 | 1929-11-30 | 1930-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-05-31 | 1933-11-30 | 1934-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-05-31 | 1937-11-30 | 1938-06-01 | $7700.00 | Window Closed / Lapsed |