Patent US2798716A successfully refreshed from Google Patents.
US2798716A
Expired / Lapsed
US
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Hearth structures for high temperature furnaces
Assignee: AT&T Inc
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Filing: 1954-01-08
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Granted: 1957-07-09
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Expires: 1974-01-08
Abstract
No abstract record available.
Inventors
- 👤 Pugh Emerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:02
CPC Classifications
C; C21; C21D; C21D9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1569444A
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US1977399A
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US2006685A
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US2137869A
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US2178527A
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US2215322A
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US2245647A
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US2545877A
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US2556962A
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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) | 1960-07-08 | 1961-01-07 | 1961-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-08 | 1965-01-07 | 1965-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-08 | 1969-01-07 | 1969-07-09 | $7700.00 | Window Closed / Lapsed |