US2913228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotating regenerative air preheater for excessive air heating
Assignee: Hitachi Zosen Inova Steinmueller GmbH
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Filing: 1952-08-07
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Granted: 1959-11-17
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Expires: 1972-08-07
Abstract
No abstract record available.
Inventors
- 👤 Fikenscher Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:28
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F28D19/041; Y; Y10; Y10S; Y10S122/00; Y10S122/01; Y10S165/00; Y10S165/009; Y10S165/013; Y10S165/016
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1975519A
Cited
GB575509A
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GB633361A
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US2628015A
Cited
US2673719A
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US2723837A
Cited
FR1065660A
Cited
US2803439A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-16 | 1963-05-18 | 1963-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-16 | 1967-05-18 | 1967-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-16 | 1971-05-18 | 1971-11-17 | $7700.00 | Window Closed / Lapsed |