US2592980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vertical flue boiler with internal heater
Assignee: Individual
•
Filing: 1949-07-13
•
Granted: 1952-04-15
•
Expires: 1969-07-13
Abstract
No abstract record available.
Inventors
- 👤 William B Van Wert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:26
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/22; F24H1/40; F24H1/24; F24H1/26; F24H1/44; F24H1/48; F24H1/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US976848A
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US1025198A
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US1676046A
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US1891809A
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US1988503A
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US2140521A
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US2110914A
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US2140522A
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US2115614A
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US2228418A
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US2244567A
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 |