Patent US2554794A successfully refreshed from Google Patents.
Patent US521440A successfully refreshed from Google Patents.
US521440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inson
Assignee: —
•
Filing: —
•
Granted: 1894-06-12
•
Expires: 1911-06-12
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:16
CPC Classifications
F; F01; F01K; F01K7/00; F01K7/34; F01K7/345; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7847; Y10T24/00; Y10T24/13; Y10T24/1321; Y10T24/1324; Y10T24/1347
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) | 1897-06-11 | 1897-12-11 | 1898-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1901-06-12 | 1901-12-12 | 1902-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1905-06-12 | 1905-12-12 | 1906-06-13 | $7700.00 | Window Closed / Lapsed |