US2558710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drop bottom mine car
Assignee: ACF Industries Inc
•
Filing: 1947-03-07
•
Granted: 1951-06-26
•
Expires: 1967-03-07
Abstract
No abstract record available.
Inventors
- 👤 Robert A Shields
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:25
CPC Classifications
B; B61; B61D; B61D7/00; B61D7/14; B61D7/16; B61D7/24; B61D7/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1387962A
Cited
US1407740A
Cited
US1606517A
Cited
US1817773A
Cited
US1888345A
Cited
US2250555A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-25 | 1954-12-25 | 1955-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-25 | 1958-12-25 | 1959-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-25 | 1962-12-25 | 1963-06-26 | $7700.00 | Window Closed / Lapsed |