Patent US2689906A successfully refreshed from Google Patents.
US2689906A
Expired / Lapsed
US
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Ceiling heater and ventilator
Assignee: NU TONE Inc
•
Filing: 1951-02-10
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Granted: 1954-09-21
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Expires: 1971-02-10
Abstract
No abstract record available.
Inventors
- 👤 Joseph R Corbett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:27
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/04; F24H3/0405; F24H3/0411
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1926537A
Cited
US1929776A
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US2037857A
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US2158601A
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US2300475A
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US2221703A
Cited
US2304042A
Cited
GB561386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |