Patent US2982346A successfully refreshed from Google Patents.
US2982346A
Expired / Lapsed
US
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High efficiency portable heater
Assignee: American Air Filter Co Inc
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Filing: 1958-11-06
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Granted: 1961-05-02
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Expires: 1978-11-06
Abstract
No abstract record available.
Inventors
- 👤 Ralph A Andersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:00
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/18; F24H9/1854; F24H9/1877; F24H9/1881; F24H3/00; F24H3/02; F24H3/06; F24H3/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-01 | 1964-10-31 | 1965-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-01 | 1968-10-31 | 1969-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-01 | 1972-10-31 | 1973-05-02 | $7700.00 | Window Closed / Lapsed |