Patent US427987A successfully refreshed from Google Patents.
US427987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
hamon
Assignee: —
•
Filing: —
•
Granted: 1890-05-13
•
Expires: 1907-05-13
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:40
CPC Classifications
E; E21; E21B; E21B3/00; E21B3/02; E21B3/04; E21B3/06; F; F16; F16H; F16H1/00; F16H1/02; F16H1/04; F16H1/12; F16H1/14; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19023; Y10T74/19074; Y10T74/19107
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) | 1893-05-12 | 1893-11-11 | 1894-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1897-05-12 | 1897-11-11 | 1898-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1901-05-13 | 1901-11-12 | 1902-05-14 | $7700.00 | Window Closed / Lapsed |