US2635587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for preheating combustion air and feed water for steam generating plants
Assignee: Svenska Maskinverken AB
•
Filing: 1946-12-02
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Granted: 1953-04-21
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Expires: 1966-12-02
Abstract
No abstract record available.
Inventors
- 👤 Dalin David
- 👤 Hagby Gustav Vilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:08
CPC Classifications
F; F22; F22D; F22D1/00; F22D1/36; F22D1/38; F22D1/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US236208A
Cited
US444976A
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US1741567A
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US1612854A
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US1833130A
Cited
US1941365A
Cited
US1975519A
Cited
US1927215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-20 | 1956-10-20 | 1957-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-20 | 1960-10-20 | 1961-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-20 | 1964-10-20 | 1965-04-21 | $7700.00 | Window Closed / Lapsed |