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Patent US1881748A successfully refreshed from Google Patents.
US1881748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Excavating machinery
Assignee: Harnischfeger Corp
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Filing: 1929-09-18
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Granted: 1932-10-11
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Expires: 1949-09-18
Abstract
No abstract record available.
Inventors
- 👤 Ljungkull Rolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:32
CPC Classifications
E; E02; E02F; E02F9/00; E02F9/003
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) | 1935-10-11 | 1936-04-11 | 1936-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-10-11 | 1940-04-11 | 1940-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-10-11 | 1944-04-11 | 1944-10-11 | $7700.00 | Window Closed / Lapsed |