Patent US3479255A successfully refreshed from Google Patents.
Patent US2188741A successfully refreshed from Google Patents.
US2188741A
Expired / Lapsed
US
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Power-operated ventilator
Assignee: AIR VAN Co
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Filing: 1938-01-28
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Granted: 1940-01-30
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Expires: 1958-01-28
Abstract
No abstract record available.
Inventors
- 👤 Thomas L Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:04
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/02; F24F7/025; F24F7/04; F24F7/06; F24F7/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-01-29 | 1943-07-31 | 1944-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-01-29 | 1947-07-31 | 1948-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-01-29 | 1951-07-31 | 1952-01-30 | $7700.00 | Window Closed / Lapsed |