Patent US2753787A successfully refreshed from Google Patents.
US2753787A
Expired / Lapsed
US
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Reversible window fan
Assignee: Individual
•
Filing: 1953-02-09
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Granted: 1956-07-10
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Expires: 1973-02-09
Abstract
No abstract record available.
Inventors
- 👤 Sidney J Heiman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:17
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/007; F24F7/013; F04; F04D; F04D29/00; F04D29/60; F04D29/64; F04D29/644; F04D29/646
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1791494A
Cited
US1988810A
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US2228224A
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US2433104A
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US2513220A
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US2608148A
Cited
US2619023A
Cited
US2715495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-10 | 1960-01-09 | 1960-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-10 | 1964-01-09 | 1964-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-10 | 1968-01-09 | 1968-07-10 | $7700.00 | Window Closed / Lapsed |