US2877870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant contact railway brake arrangement
Assignee: American Steel Foundries
•
Filing: 1955-11-14
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Granted: 1959-03-17
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Expires: 1975-11-14
Abstract
No abstract record available.
Inventors
- 👤 Carl E Tack
- 👤 Walter R Polanin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:58
CPC Classifications
B; B61; B61H; B61H1/00; B61H13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2051967A
Cited
US2352222A
Cited
US2665778A
Cited
USRE24176E
Cited
US2685621A
Cited
US2769509A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |