US2615434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Header and tubes of a forced circulation steam generator
Assignee: Combustion Engineering Inc
•
Filing: 1948-07-21
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Granted: 1952-10-28
•
Expires: 1968-07-21
Abstract
No abstract record available.
Inventors
- 👤 Ward S Patterson
- 👤 Ernest C Witzke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:05
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/62; F22B37/70; F22B37/74
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE590176C
Cited
US1103531A
Cited
US1154194A
Cited
US1231928A
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US1364272A
Cited
GB278099A
Cited
US1988659A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-28 | 1956-04-28 | 1956-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-28 | 1960-04-28 | 1960-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-28 | 1964-04-28 | 1964-10-28 | $7700.00 | Window Closed / Lapsed |