Patent US2890496A successfully refreshed from Google Patents.
Patent US3039209A successfully refreshed from Google Patents.
US3039209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ditch forming attachment for a road grader
Assignee: Individual
•
Filing: 1959-03-13
•
Granted: 1962-06-19
•
Expires: 1979-03-13
Abstract
No abstract record available.
Inventors
- 👤 James C Cron
- 👤 John L Sprinkle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:42
CPC Classifications
E; E02; E02F; E02F5/00; E02F5/02; E02F5/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1403969A
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US1535384A
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US1753150A
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US1873482A
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US2615264A
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US2556508A
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US2726463A
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US2797505A
Cited
US2946145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-06-18 | 1965-12-18 | 1966-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-18 | 1969-12-18 | 1970-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-18 | 1973-12-18 | 1974-06-19 | $7700.00 | Window Closed / Lapsed |