Patent US3416470A successfully refreshed from Google Patents.
US3416470A
Expired / Lapsed
US
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Method of controlling and/or regulating induced draught fans for waste heat boilers
Assignee: Deutsche Babcock and Wilcox Dampfkesselwerke AG
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Filing: 1965-11-04
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Granted: 1968-12-17
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Expires: 1985-11-04
Abstract
No abstract record available.
Inventors
- 👤 Hey Ernst Friedrich
- 👤 Kuipers Hans
- 👤 Schiel Volker
- 👤 Erich Friedl
- 👤 Hoffmann Germuth Von
- 👤 Braun Eugen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:10
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/18; F23N5/187; C; C21; C21C; C21C5/00; C21C5/28; C21C5/38; F01; F01K; F01K3/00; F01K3/18; F01K3/185; F04; F04D; F04D27/00; F04D27/002; F22; F22B; F22B1/00; F22B1/02; F22B1/18; F22B1/183; F23D; F23D14/00; F23D14/46; F23D14/60; F23L; F23L17/00; F23N3/00; F23N3/04; F23N3/045; F23L2700/00; F23L2700/001; F23N2233/00; F23N2233/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-17 | 1972-06-17 | 1972-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-17 | 1976-06-17 | 1976-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-17 | 1980-06-17 | 1980-12-17 | $7700.00 | Window Closed / Lapsed |