Patent US12912A successfully refreshed from Google Patents.
US2531779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spreader stoker
Assignee: American Engineering Co Ltd
•
Filing: 1945-06-16
•
Granted: 1950-11-28
•
Expires: 1965-06-16
Abstract
No abstract record available.
Inventors
- 👤 Ernst L Midgette
- 👤 Robert W Reid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:16
CPC Classifications
F; F23; F23K; F23K3/00; F23K3/16
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US578630A
Cited
US767084A
Cited
US944959A
Cited
US1975224A
Cited
US2075736A
Cited
US2045357A
Cited
US2099618A
Cited
US2146469A
Cited
US2258757A
Cited
US2255841A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-27 | 1954-05-29 | 1954-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-27 | 1958-05-29 | 1958-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-27 | 1962-05-29 | 1962-11-28 | $7700.00 | Window Closed / Lapsed |