US2471128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Incandescent electric heater
Assignee: Individual
•
Filing: 1945-10-23
•
Granted: 1949-05-24
•
Expires: 1965-10-23
Abstract
No abstract record available.
Inventors
- 👤 John I Stein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:10
CPC Classifications
F; F24; F24H; F24H7/00; F24H7/02; F24H7/0208
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US491319A
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US1848716A
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US687505A
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US1286395A
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US1655983A
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US1775351A
Cited
US1992515A
Cited
US1892882A
Cited
US1937065A
Cited
US2186718A
Cited
US2210720A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-23 | 1952-11-22 | 1953-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-23 | 1956-11-22 | 1957-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-23 | 1960-11-22 | 1961-05-24 | $7700.00 | Window Closed / Lapsed |