Patent US3052998A successfully refreshed from Google Patents.
US3052998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Land leveller
Assignee: Individual
•
Filing: 1960-10-18
•
Granted: 1962-09-11
•
Expires: 1980-10-18
Abstract
No abstract record available.
Inventors
- 👤 Claude E Childers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:57
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F3/7663
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US425793A
Cited
US1317037A
Cited
US1711350A
Cited
US1973372A
Cited
US2160376A
Cited
US2142262A
Cited
US2745674A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-10 | 1966-03-12 | 1966-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-10 | 1970-03-12 | 1970-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-10 | 1974-03-12 | 1974-09-11 | $7700.00 | Window Closed / Lapsed |