Patent US4238296A successfully refreshed from Google Patents.
Patent US3387569A successfully refreshed from Google Patents.
US3387569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railway truck and spring bolster structure
Assignee: Lukens General Industries Inc
•
Filing: 1966-01-24
•
Granted: 1968-06-11
•
Expires: 1986-01-24
Abstract
No abstract record available.
Inventors
- 👤 Richard L Lich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:48
CPC Classifications
B; B61; B61F; B61F3/00; B61F3/02; B61F3/04; B61F3/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1484954A
Cited
US2740359A
Cited
US2782026A
Cited
US2861522A
Cited
US2907282A
Cited
US2954747A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-11 | 1971-12-11 | 1972-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-11 | 1975-12-11 | 1976-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-11 | 1979-12-11 | 1980-06-11 | $7700.00 | Window Closed / Lapsed |