Patent US2420833A successfully refreshed from Google Patents.
US2420833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railway roadbed
Assignee: Individual
•
Filing: 1944-10-07
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Granted: 1947-05-20
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Expires: 1964-10-07
Abstract
No abstract record available.
Inventors
- 👤 Monroe Benjamin Cullen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:20
CPC Classifications
E; E01; E01B; E01B1/00; E01B1/001; E01B1/008; E01B2204/00; E01B2204/01; E01B2204/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2148773A
Cited
US1355833A
Cited
US1408134A
Cited
US1569702A
Cited
US1702841A
Cited
FR702640A
Cited
US2353027A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-19 | 1950-11-18 | 1951-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-19 | 1954-11-18 | 1955-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-19 | 1958-11-18 | 1959-05-20 | $7700.00 | Window Closed / Lapsed |