Patent US2658743A successfully refreshed from Google Patents.
US2658743A
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Melting furnace
Assignee: Johns Manville Corp
•
Filing: 1949-10-21
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Granted: 1953-11-10
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Expires: 1969-10-21
Abstract
No abstract record available.
Inventors
- 👤 Speil Sidney
- 👤 Edward R Powell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:55
CPC Classifications
C; C03; C03B; C03B3/00; C03B3/02; C03B5/00; C03B5/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE460846C
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US691648A
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US905117A
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US1481348A
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USRE20828E
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US1871863A
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AT139665B
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US2131599A
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US2523835A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |