US2959406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Open hearth furnace regenerator
Assignee: General Refractories Co
•
Filing: 1955-08-01
•
Granted: 1960-11-08
•
Expires: 1975-08-01
Abstract
No abstract record available.
Inventors
- 👤 Heuer Russell Pearce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:27
CPC Classifications
F; F28; F28D; F28D17/00; F28D17/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2571102A
Cited
US1924936A
Cited
US1905677A
Cited
US2537013A
Cited
US2647062A
Cited
US2771285A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-08 | 1964-05-09 | 1964-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-08 | 1968-05-09 | 1968-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-08 | 1972-05-09 | 1972-11-08 | $7700.00 | Window Closed / Lapsed |