US2661906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic control arrangement in central heating systems
Assignee: D'investigation & D'exploitation De Brevets Ste
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Filing: 1951-07-18
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Granted: 1953-12-08
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Expires: 1971-07-18
Abstract
No abstract record available.
Inventors
- 👤 Gosta E Stahlberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:34
CPC Classifications
F; F24; F24D; F24D19/00; F24D19/10; F24D19/1006; F24D19/1009; F24D19/1015; F24D19/1024; F24D19/1033
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1728551A
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GB388773A
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FR777297A
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US2137059A
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US2141942A
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US2236624A
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US2355043A
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US2496860A
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US2488780A
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US2547933A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-07 | 1957-06-08 | 1957-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-07 | 1961-06-08 | 1961-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-07 | 1965-06-08 | 1965-12-08 | $7700.00 | Window Closed / Lapsed |