Patent US2251589A successfully refreshed from Google Patents.
US2251589A
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US
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Boiler
Assignee: H B SMITH CO Inc
•
Filing: 1939-11-27
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Granted: 1941-08-05
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Expires: 1959-11-27
Abstract
No abstract record available.
Inventors
- 👤 Edwin L Hannum
- 👤 Lauren E Seeley
- 👤 Edgar C Desjardins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:28
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/22; F24H1/24; F24H1/30; F24H1/32; F22; F22B; F22B13/00; F22B13/005
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) | 1944-08-04 | 1945-02-03 | 1945-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-08-04 | 1949-02-03 | 1949-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-08-04 | 1953-02-03 | 1953-08-05 | $7700.00 | Window Closed / Lapsed |