Patent US2419640A successfully refreshed from Google Patents.
US2419640A
Expired / Lapsed
US
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Ventilator screen and closure package
Assignee: Individual
•
Filing: 1944-06-19
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Granted: 1947-04-29
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Expires: 1964-06-19
Abstract
No abstract record available.
Inventors
- 👤 Hugo F Gustafson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:38
CPC Classifications
E; E06; E06B; E06B7/00; E06B7/02; E06B7/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US542501A
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US775798A
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US1716324A
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US1996426A
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US2004762A
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US1917186A
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US1890181A
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US2101941A
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US2270393A
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US2230719A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-04-28 | 1950-10-28 | 1951-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-04-28 | 1954-10-28 | 1955-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-04-28 | 1958-10-28 | 1959-04-29 | $7700.00 | Window Closed / Lapsed |