Patent US1146284A successfully refreshed from Google Patents.
US1146284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air and water blowpipe for rock-drilling.
Assignee: Individual
•
Filing: 1913-01-16
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Granted: 1915-07-13
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Expires: 1933-01-16
Abstract
No abstract record available.
Inventors
- 👤 Frank T Sanders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:02
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/12
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) | 1918-07-12 | 1919-01-11 | 1919-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1922-07-12 | 1923-01-11 | 1923-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1926-07-12 | 1927-01-11 | 1927-07-13 | $7700.00 | Window Closed / Lapsed |