Patent US2593032A successfully refreshed from Google Patents.
US2593032A
Expired / Lapsed
US
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Vertical flue downdraft boiler
Assignee: Individual
•
Filing: 1946-08-03
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Granted: 1952-04-15
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Expires: 1966-08-03
Abstract
No abstract record available.
Inventors
- 👤 Jesse C Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:10
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/48; F24H1/50; F24H1/22; F24H1/24; F24H1/26; F24H1/28; F24H1/285
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1957741A
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GB385644A
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GB409961A
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US2189365A
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US2264226A
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US2383924A
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US2464701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-15 | 1955-10-15 | 1956-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-15 | 1959-10-15 | 1960-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-15 | 1963-10-15 | 1964-04-15 | $7700.00 | Window Closed / Lapsed |