Patent US54212A successfully refreshed from Google Patents.
US54212A
Expired / Lapsed
US
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Improvement in shaft-couplings
Assignee: —
•
Filing: —
•
Granted: 1866-04-24
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Expires: 1883-04-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:10
CPC Classifications
F; F16; F16B; F16B7/00; F16B7/04; F16B7/0406; F16B7/0426; F16D; F16D1/00; F16D1/02; F16D1/04; F16D1/06; F16D1/08; F16D1/0852; F16D1/0864; Y; Y10; Y10T; Y10T403/00; Y10T403/57; Y10T403/5761; Y10T403/5766; Y10T403/5781
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1869-04-23 | 1869-10-23 | 1870-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1873-04-23 | 1873-10-23 | 1874-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1877-04-23 | 1877-10-23 | 1878-04-24 | $7700.00 | Window Closed / Lapsed |