US2780324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined manual and automatic slack adjuster for the foundation brake rigging of railway freight cars
Assignee: Individual
•
Filing: 1951-09-14
•
Granted: 1957-02-05
•
Expires: 1971-09-14
Abstract
No abstract record available.
Inventors
- 👤 Charles M O'boyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:59
CPC Classifications
B; B61; B61H; B61H15/00; B61H15/0007; B61H15/0014; B61H15/0021; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1558
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US636305A
Cited
US704508A
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US1136620A
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US1618783A
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US1738395A
Cited
US1801854A
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US1798436A
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US2675894A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-05 | 1960-08-06 | 1961-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-05 | 1964-08-06 | 1965-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-05 | 1968-08-06 | 1969-02-05 | $7700.00 | Window Closed / Lapsed |