Patent US2517399A successfully refreshed from Google Patents.
US2517399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heater having means to recirculate partially cooled products of combustion
Assignee: Stewart Warner Corp
•
Filing: 1945-03-23
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Granted: 1950-08-01
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Expires: 1965-03-23
Abstract
No abstract record available.
Inventors
- 👤 Mccollum Thelma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:56
CPC Classifications
B; B64; B64D; B64D13/00; B64D13/06; B64D13/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US751350A
Cited
US889236A
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US1879011A
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US1885674A
Cited
US2174663A
Cited
US2150345A
Cited
US2197495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-31 | 1954-01-30 | 1954-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-31 | 1958-01-30 | 1958-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-31 | 1962-01-30 | 1962-08-01 | $7700.00 | Window Closed / Lapsed |