US2950057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rail crossing
Assignee: SPEER FILLER STRIP CO
•
Filing: 1953-09-11
•
Granted: 1960-08-23
•
Expires: 1973-09-11
Abstract
No abstract record available.
Inventors
- 👤 Speer Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:11
CPC Classifications
E; E01; E01C; E01C9/00; E01C9/04; E01B; E01B15/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US228353A
Cited
US293024A
Cited
GB191417164A
Cited
US2101883A
Cited
US2025209A
Cited
US2230303A
Cited
CH209948A
Cited
US2574926A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-23 | 1964-02-22 | 1964-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-23 | 1968-02-22 | 1968-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-23 | 1972-02-22 | 1972-08-23 | $7700.00 | Window Closed / Lapsed |