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US2770833A
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Assignee: ILG ELECTRIC VENTILATING CO
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Filing: 1953-01-15
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Granted: 1956-11-20
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Expires: 1973-01-15
Abstract
No abstract record available.
Inventors
- 👤 Fred E Drechsel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:31
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08; F24F13/10; F24F13/14; F24F13/1486; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/20; F16K1/2007; F16K1/2028; F24F13/1406; F24F13/1426; F24F2013/146
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE643792C
Cited
US1007406A
Cited
US1589507A
Cited
US2299833A
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US2321118A
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US2579395A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-20 | 1960-05-21 | 1960-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-20 | 1964-05-21 | 1964-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-20 | 1968-05-21 | 1968-11-20 | $7700.00 | Window Closed / Lapsed |