Patent US2561152A successfully refreshed from Google Patents.
US2561152A
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US
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Ditch digging machine with warning device
Assignee: Individual
•
Filing: 1947-05-20
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Granted: 1951-07-17
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Expires: 1967-05-20
Abstract
No abstract record available.
Inventors
- 👤 Albert R Stryker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:51
CPC Classifications
E; E02; E02F; E02F9/00; E02F9/24; E02F9/245; G; G01; G01V; G01V3/00; G01V3/02; G01V3/04; Y; Y10; Y10S; Y10S37/00; Y10S37/906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1850412A
Cited
US2131291A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-16 | 1955-01-15 | 1955-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-16 | 1959-01-15 | 1959-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-16 | 1963-01-15 | 1963-07-17 | $7700.00 | Window Closed / Lapsed |