US2633831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boiler
Assignee: Babcock and Wilcox Co
•
Filing: 1946-03-12
•
Granted: 1953-04-07
•
Expires: 1966-03-12
Abstract
No abstract record available.
Inventors
- 👤 Ivar L Langvand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:29
CPC Classifications
F; F22; F22B; F22B21/00; F22B21/34
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-06 | 1956-10-06 | 1957-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-06 | 1960-10-06 | 1961-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-06 | 1964-10-06 | 1965-04-07 | $7700.00 | Window Closed / Lapsed |