US2470978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trailer caster
Assignee: DETROIT ENGINEERING LAB Inc
•
Filing: 1946-09-21
•
Granted: 1949-05-24
•
Expires: 1966-09-21
Abstract
No abstract record available.
Inventors
- 👤 Brie Stanley R Du
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:52
CPC Classifications
B; B60; B60G; B60G11/00; B60G11/14; B62; B62D; B62D63/00; B62D63/06; B62D63/062; B62D63/065; B62D63/067
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1177237A
Cited
US2087299A
Cited
US2163850A
Cited
GB523115A
Cited
US2271304A
Cited
US2282506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-23 | 1952-11-22 | 1953-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-23 | 1956-11-22 | 1957-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-23 | 1960-11-22 | 1961-05-24 | $7700.00 | Window Closed / Lapsed |