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US2428874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reciprocating bar grate
Assignee: —
•
Filing: —
•
Granted: 1947-10-14
•
Expires: 1964-10-14
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:03
CPC Classifications
F; F23; F23K; F23K3/00; F23K3/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US689827A
Cited
US1048356A
Cited
US859413A
Cited
US1644953A
Cited
DE377224C
Cited
US1522917A
Cited
US1564813A
Cited
GB309459A
Cited
US1913396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-13 | 1951-04-14 | 1951-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-13 | 1955-04-14 | 1955-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-13 | 1959-04-14 | 1959-10-14 | $7700.00 | Window Closed / Lapsed |