Patent DE740839C successfully refreshed from Google Patents.
Patent US2509856A successfully refreshed from Google Patents.
US2509856A
Expired / Lapsed
US
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Heating apparatus
Assignee: Selas Corp of America
•
Filing: 1946-04-18
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Granted: 1950-05-30
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Expires: 1966-04-18
Abstract
No abstract record available.
Inventors
- 👤 Blaha Emil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:18
CPC Classifications
F; F27; F27B; F27B9/00; F27B9/06; F27B9/08; F27B9/082
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2127742A
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US2088554A
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US2215079A
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US2220928A
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US2268987A
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US2256275A
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US2287246A
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US2339477A
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US2371420A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-29 | 1953-11-28 | 1954-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-29 | 1957-11-28 | 1958-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-29 | 1961-11-28 | 1962-05-30 | $7700.00 | Window Closed / Lapsed |