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US3418108A
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Externally fired cupola furnace and method of operation thereof
Assignee: Industrial Science Corp
•
Filing: 1965-12-17
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Granted: 1968-12-24
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Expires: 1985-12-17
Abstract
No abstract record available.
Inventors
- 👤 Stroh Gerald F H Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:53
CPC Classifications
F; F27; F27B; F27B1/00; F27B1/08; Y; Y10; Y10S; Y10S266/00; Y10S266/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1831254A
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US1876260A
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US1977428A
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US2544697A
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US2784037A
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US3338707A
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GB998213A
Cited
US3373981A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |