US2665544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Nutone Inc
•
Filing: 1950-03-07
•
Granted: 1954-01-12
•
Expires: 1970-03-07
Abstract
No abstract record available.
Inventors
- 👤 Harry C Rowe
- 👤 Elmer H Bladh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:17
CPC Classifications
G; G04; G04C; G04C21/00; G04C21/04; G04C21/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1398972A
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USRE21370E
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US1007232A
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US1322216A
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GB161381A
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GB202516A
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FR36808E
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US1983236A
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US2097487A
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FR817652A
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US2307104A
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US2363859A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |