US2456570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smokeless heater for burning coal
Assignee: —
•
Filing: —
•
Granted: 1948-12-14
•
Expires: 1965-12-14
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:43
CPC Classifications
—
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2403829A
Cited
US91857A
Cited
US468875A
Cited
US552911A
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US603453A
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DE131699C
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US733432A
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US866010A
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US905366A
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US1034799A
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US1544582A
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US1501847A
Cited
US1561497A
Cited
US1781811A
Cited
DE585289C
Cited
US2295781A
Cited
CH215371A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-14 | 1952-06-14 | 1952-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-14 | 1956-06-14 | 1956-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-14 | 1960-06-14 | 1960-12-14 | $7700.00 | Window Closed / Lapsed |