US3387590A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for regulating the total heat output in a burning fluidized bed heat exchanger or boiler
Assignee: United States Department of the Interior
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Filing: 1967-03-16
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Granted: 1968-06-11
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Expires: 1987-03-16
Abstract
No abstract record available.
Inventors
- 👤 John W Bishop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:46
CPC Classifications
F; F23; F23C; F23C10/00; F23C10/18; F23C10/28; F23C10/30; F22; F22B; F22B31/00; F22B31/0007; F22B31/0015; F22B31/003
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) | 1971-06-11 | 1971-12-11 | 1972-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-11 | 1975-12-11 | 1976-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-11 | 1979-12-11 | 1980-06-11 | $7700.00 | Window Closed / Lapsed |