Patent US2697989A successfully refreshed from Google Patents.
US2697989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Car truck
Assignee: National Malleable and Steel Castings Co
•
Filing: 1947-06-21
•
Granted: 1954-12-28
•
Expires: 1967-06-21
Abstract
No abstract record available.
Inventors
- 👤 James A Shafer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:03
CPC Classifications
B; B61; B61F; B61F5/00; B61F5/02; B61F5/04; B61F5/12; B61F5/122
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1493192A
Cited
US1894385A
Cited
US2352693A
Cited
US2378414A
Cited
US2375918A
Cited
US2424936A
Cited
US2413458A
Cited
US2382563A
Cited
US2425822A
Cited
US2407875A
Cited
US2437359A
Cited
US2434583A
Cited
US2575137A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-27 | 1958-06-28 | 1958-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-27 | 1962-06-28 | 1962-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-27 | 1966-06-28 | 1966-12-28 | $7700.00 | Window Closed / Lapsed |