US1756971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trenching machine
Assignee: Harnischfeger Corp
•
Filing: 1927-07-08
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Granted: 1930-05-06
•
Expires: 1947-07-08
Abstract
No abstract record available.
Inventors
- 👤 Robert L Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:17
CPC Classifications
E; E02; E02F; E02F9/00; E02F9/02; E02F9/20; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19023; Y10T74/19074; Y10T74/19107; Y10T74/19167
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) | 1933-05-05 | 1933-11-04 | 1934-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-05-05 | 1937-11-04 | 1938-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-05-05 | 1941-11-04 | 1942-05-06 | $7700.00 | Window Closed / Lapsed |