Patent US2474155A successfully refreshed from Google Patents.
US2474155A
Expired / Lapsed
US
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Heating apparatus
Assignee: Individual
•
Filing: 1945-06-15
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Granted: 1949-06-21
•
Expires: 1965-06-15
Abstract
No abstract record available.
Inventors
- 👤 Julius F Melzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:46
CPC Classifications
F; F28; F28F; F28F27/00; F28D; F28D7/00; F28D7/06; F28D7/16; F28F9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US850923A
Cited
US1024729A
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FR452416A
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US1722884A
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US1960856A
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US2028173A
Cited
US2144030A
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US2296325A
Cited
US2307341A
Cited
US2421144A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-20 | 1952-12-20 | 1953-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-20 | 1956-12-20 | 1957-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-20 | 1960-12-20 | 1961-06-21 | $7700.00 | Window Closed / Lapsed |