US2781174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual heat-hot water tankless system
Assignee: Individual
•
Filing: 1954-04-27
•
Granted: 1957-02-12
•
Expires: 1974-04-27
Abstract
No abstract record available.
Inventors
- 👤 George J Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:56
CPC Classifications
F; F24; F24D; F24D3/00; F24D3/08; F24D3/087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1843566A
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US2110952A
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US2159284A
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US2176539A
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US2348610A
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US2322872A
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US2404597A
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US2520446A
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US2515885A
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US2721706A
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US2700506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-12 | 1960-08-13 | 1961-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-12 | 1964-08-13 | 1965-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-12 | 1968-08-13 | 1969-02-12 | $7700.00 | Window Closed / Lapsed |