US2531344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air feeding and cooled furnace front structure
Assignee: RUDY FURNACE Co
•
Filing: 1947-11-05
•
Granted: 1950-11-21
•
Expires: 1967-11-05
Abstract
No abstract record available.
Inventors
- 👤 Thomas H Polad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:37
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US277361A
Cited
US1154606A
Cited
US1470309A
Cited
GB190111200A
Cited
US807743A
Cited
US1559318A
Cited
US1507469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |