US2439843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction shock absorbing mechanism for railway draft riggings
Assignee: W H MINER Inc
•
Filing: 1944-05-19
•
Granted: 1948-04-20
•
Expires: 1964-05-19
Abstract
No abstract record available.
Inventors
- 👤 George E Dath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:54
CPC Classifications
B; B61; B61G; B61G9/00; B61G9/04; B61G9/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1169826A
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US1700260A
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US1971420A
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US1871451A
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US1753937A
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US2238083A
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US2277881A
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US2291831A
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US2354826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-20 | 1951-10-20 | 1952-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-20 | 1955-10-20 | 1956-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-20 | 1959-10-20 | 1960-04-20 | $7700.00 | Window Closed / Lapsed |