US2822136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined hot air furnace and domestic water heater
Assignee: Svenska Maskinverken AB
•
Filing: 1952-12-11
•
Granted: 1958-02-04
•
Expires: 1972-12-11
Abstract
No abstract record available.
Inventors
- 👤 Dalin David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:10
CPC Classifications
F; F24; F24C; F24C13/00; F24H; F24H6/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1980688A
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US1889588A
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US2129202A
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US2159284A
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US2244831A
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US2203187A
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US2249554A
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US2225023A
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US2440052A
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US2533508A
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US2435875A
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US2526464A
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US2556671A
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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) | 1961-02-03 | 1961-08-05 | 1962-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-03 | 1965-08-05 | 1966-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-03 | 1969-08-05 | 1970-02-04 | $7700.00 | Window Closed / Lapsed |