Patent US5498175A successfully refreshed from Google Patents.
Patent US3404663A successfully refreshed from Google Patents.
US3404663A
Expired / Lapsed
US
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Prevention of furnace corrosion
Assignee: Combustion Engineering Inc
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Filing: 1965-12-29
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Granted: 1968-10-08
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Expires: 1985-12-29
Abstract
No abstract record available.
Inventors
- 👤 Everett C Lewis
- 👤 Robert G Tallent
- 👤 Arthur L Plumley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:57
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/025; F23; F23G; F23G5/00; F23G5/44; F23G5/48
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) | 1971-10-08 | 1972-04-08 | 1972-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-08 | 1976-04-08 | 1976-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-08 | 1980-04-08 | 1980-10-08 | $7700.00 | Window Closed / Lapsed |