US2780981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating apparatus
Assignee: Individual
•
Filing: 1953-09-30
•
Granted: 1957-02-12
•
Expires: 1973-09-30
Abstract
No abstract record available.
Inventors
- 👤 John K Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:33
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/04; F24F7/06; F24F7/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US288004A
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US706888A
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US1734449A
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US1601191A
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US1692775A
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US1739082A
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US2338356A
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US2349668A
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US2297050A
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US2297049A
Cited
US2630056A
Cited
US2619021A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-12 | 1960-08-13 | 1961-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-12 | 1964-08-13 | 1965-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-12 | 1968-08-13 | 1969-02-12 | $7700.00 | Window Closed / Lapsed |