Patent US2516666A successfully refreshed from Google Patents.
US2516666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating system
Assignee: Individual
•
Filing: 1946-06-03
•
Granted: 1950-07-25
•
Expires: 1966-06-03
Abstract
No abstract record available.
Inventors
- 👤 Lindsay M Applegate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:17
CPC Classifications
F; F24; F24C; F24C7/00; F24C7/08; F24C7/087; F24C7/088
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US723797A
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US1359889A
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US1560377A
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US1894119A
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US2034955A
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US2015624A
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US2078675A
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US2103560A
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US2178644A
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US2263742A
Cited
US2279525A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-24 | 1954-01-23 | 1954-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-24 | 1958-01-23 | 1958-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-24 | 1962-01-23 | 1962-07-25 | $7700.00 | Window Closed / Lapsed |