Patent US3000121A successfully refreshed from Google Patents.
US3000121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic vertical control of earth moving machines
Assignee: Collins Radio Co
•
Filing: 1956-05-21
•
Granted: 1961-09-19
•
Expires: 1976-05-21
Abstract
No abstract record available.
Inventors
- 👤 David O Martin
- 👤 Frank J Ocnaschek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:54
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F3/80; E02F3/84; E02F3/844; E02F3/847
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1370688A
Cited
US1486886A
Cited
US1996233A
Cited
US2043413A
Cited
US2370000A
Cited
US2425541A
Cited
US2494069A
Cited
US2458334A
Cited
US2796685A
Cited
US2817764A
Cited
US2916836A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |