Patent US1999785A successfully refreshed from Google Patents.
Patent US2980082A successfully refreshed from Google Patents.
US2980082A
Expired / Lapsed
US
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Method of operating a steam generator
Assignee: Combustion Engineering Inc
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Filing: 1955-02-16
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Granted: 1961-04-18
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Expires: 1975-02-16
Abstract
No abstract record available.
Inventors
- 👤 Arthur C Firl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:54
CPC Classifications
F; F22; F22G; F22G5/00; F22G5/20; F22B; F22B35/00; F22B35/002; F22G5/02; F22G5/04
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) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |