US2975730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Load retarding device
Assignee: United States Steel Corp
•
Filing: 1959-11-03
•
Granted: 1961-03-21
•
Expires: 1979-11-03
Abstract
No abstract record available.
Inventors
- 👤 Wilbert G Nichol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:55
CPC Classifications
B; B61; B61D; B61D45/00; B61D45/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1413690A
Cited
US2846957A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |