US2930601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Open-hearth furnace construction
Assignee: General Refractories Co
•
Filing: 1956-11-06
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Granted: 1960-03-29
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Expires: 1976-11-06
Abstract
No abstract record available.
Inventors
- 👤 Heuer Russell Pearce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:03
CPC Classifications
F; F27; F27B; F27B3/00; F27B3/10; F27B3/12; F27D; F27D1/00; F27D1/0003; F27D1/004; F27D1/02; F27D1/025; F27D1/04; F27D1/06; F27D1/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |