Patent US2558097A successfully refreshed from Google Patents.
US2558097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam heating apparatus
Assignee: Westinghouse Electric Corp
•
Filing: 1947-10-23
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Granted: 1951-06-26
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Expires: 1967-10-23
Abstract
No abstract record available.
Inventors
- 👤 William D Maurer
- 👤 Edgar L Wolfe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:37
CPC Classifications
D; D06; D06C; D06C7/00; D06C2700/00; D06C2700/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2042792A
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US2297976A
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US2203480A
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US2204801A
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US2255859A
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US2308511A
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US2303612A
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US2312186A
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US2376839A
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US2420739A
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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) | 1954-06-25 | 1954-12-25 | 1955-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-25 | 1958-12-25 | 1959-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-25 | 1962-12-25 | 1963-06-26 | $7700.00 | Window Closed / Lapsed |