US1741497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earth-drilling apparatus
Assignee: Individual
•
Filing: 1925-09-09
•
Granted: 1929-12-31
•
Expires: 1945-09-09
Abstract
No abstract record available.
Inventors
- 👤 Fred S Boltz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:21
CPC Classifications
E; E21; E21B; E21B25/00; E21B25/02; E21B25/04; E21B10/00; E21B10/26; E21B10/32; E21B10/64; E21B10/66; E21B19/00; E21B19/08; E21B19/084; E21B21/00; E21B21/002; E21B21/10; E21B27/00; E21B27/005; E21B27/04; E21B33/00; E21B33/10; E21B33/12; E21B33/124; E21B33/1243; E21B7/00; E21B7/20; E21B7/201
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) | 1932-12-30 | 1933-07-01 | 1933-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-12-30 | 1937-07-01 | 1937-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-12-30 | 1941-07-01 | 1941-12-31 | $7700.00 | Window Closed / Lapsed |