Patent US2575723A successfully refreshed from Google Patents.
US2575723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vertical flue boiler
Assignee: Individual
•
Filing: 1948-06-18
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Granted: 1951-11-20
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Expires: 1968-06-18
Abstract
No abstract record available.
Inventors
- 👤 Benedict W Mandelburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:21
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/22; F24H1/38
Claims Analysis
Total Claims: 0
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US822607A
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US1944506A
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US2119606A
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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) | 1954-11-19 | 1955-05-21 | 1955-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-19 | 1959-05-21 | 1959-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-19 | 1963-05-21 | 1963-11-20 | $7700.00 | Window Closed / Lapsed |