Patent US2421602A successfully refreshed from Google Patents.
US2421602A
Expired / Lapsed
US
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Expansion repair plate for worn railway ties
Assignee: LOUIS J O MALLEY
•
Filing: 1944-01-15
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Granted: 1947-06-03
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Expires: 1964-01-15
Abstract
No abstract record available.
Inventors
- 👤 John H Dooling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:51
CPC Classifications
E; E01; E01B; E01B9/00; E01B9/68; E01B9/681; E01B9/683; E01B9/685; E01B9/686; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31815
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-02 | 1950-12-02 | 1951-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-02 | 1954-12-02 | 1955-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-02 | 1958-12-02 | 1959-06-03 | $7700.00 | Window Closed / Lapsed |