Patent US2547448A successfully refreshed from Google Patents.
US2547448A
Expired / Lapsed
US
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Hot-air space heater
Assignee: Individual
•
Filing: 1946-02-20
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Granted: 1951-04-03
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Expires: 1966-02-20
Abstract
No abstract record available.
Inventors
- 👤 Demuth Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:17
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/06; F24H3/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1126348A
Cited
GB111177A
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US1861812A
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US2247987A
Cited
GB396468A
Cited
US2190937A
Cited
GB509220A
Cited
US2207201A
Cited
US2363839A
Cited
US2367104A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |