US2320874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mining machine
Assignee: HYDRAULIE MACHINERY Inc
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Filing: 1941-01-18
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Granted: 1943-06-01
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Expires: 1961-01-18
Abstract
No abstract record available.
Inventors
- 👤 Albert F Lehmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:54
CPC Classifications
E; E21; E21B; E21B44/00; E21B44/02; E21B44/06
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) | 1946-05-31 | 1946-11-30 | 1947-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-05-31 | 1950-11-30 | 1951-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-05-31 | 1954-11-30 | 1955-06-01 | $7700.00 | Window Closed / Lapsed |