Patent US2990634A successfully refreshed from Google Patents.
US2990634A
Expired / Lapsed
US
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Digger tooth
Assignee: Esco Corp
•
Filing: 1959-04-03
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Granted: 1961-07-04
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Expires: 1979-04-03
Abstract
No abstract record available.
Inventors
- 👤 Eyolfson Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:40
CPC Classifications
E; E02; E02F; E02F9/00; E02F9/28; E02F9/2808; E02F9/2816; E02F9/2833; E02F9/2841
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190327698A
Cited
US1172813A
Cited
US2312802A
Cited
GB565417A
Cited
US2702490A
Cited
US2674816A
Cited
US2846790A
Cited
US2904908A
Cited
US2951300A
Cited
US2949687A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |