US2495550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Operating gas heater for thermal power plants
Assignee: Aktiengesellschaft fuer Technische Studien
•
Filing: 1945-04-13
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Granted: 1950-01-24
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Expires: 1965-04-13
Abstract
No abstract record available.
Inventors
- 👤 Ruegg Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:49
CPC Classifications
F; F02; F02C; F02C1/00; F02C1/04; F02C1/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US164101A
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US498826A
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US1231373A
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US1650300A
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US1789401A
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US2172910A
Cited
US2174663A
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US2268074A
Cited
US2385177A
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US2422131A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-23 | 1953-07-25 | 1954-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-23 | 1957-07-25 | 1958-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-23 | 1961-07-25 | 1962-01-24 | $7700.00 | Window Closed / Lapsed |