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Patent US1935635A successfully refreshed from Google Patents.
US1935635A
Expired / Lapsed
US
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Boiler with water wall tubes
Assignee: Babcock and Wilcox Co
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Filing: 1929-04-09
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Granted: 1933-11-21
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Expires: 1949-04-09
Abstract
No abstract record available.
Inventors
- 👤 David S Jacobus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:08
CPC Classifications
F; F22; F22B; F22B29/00; F22B29/02; F22B37/00; F22B37/02; F22B37/10; F22B37/14; F22B37/142
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1936-11-20 | 1937-05-22 | 1937-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-11-20 | 1941-05-22 | 1941-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-11-20 | 1945-05-22 | 1945-11-21 | $7700.00 | Window Closed / Lapsed |