US2102576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock drill sludge ejector
Assignee: Independent Pneumatic Tool Co
•
Filing: 1936-05-06
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Granted: 1937-12-14
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Expires: 1956-05-06
Abstract
No abstract record available.
Inventors
- 👤 Arthur H Skaer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:23
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/01; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17111
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) | 1940-12-13 | 1941-06-14 | 1941-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-12-13 | 1945-06-14 | 1945-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-12-13 | 1949-06-14 | 1949-12-14 | $7700.00 | Window Closed / Lapsed |