Patent US549725A successfully refreshed from Google Patents.
US2855841A
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Louver type ventilator
Assignee: SMITH
•
Filing: 1954-05-17
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Granted: 1958-10-14
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Expires: 1974-05-17
Abstract
No abstract record available.
Inventors
- 👤 Lester L Smith
- 👤 Frank E Randall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:56
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08; B; B65; B65B; B65B35/00; B65B35/30; B65B35/54; F24F13/082
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1051842A
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US1253387A
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US1896656A
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US2509016A
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US2555626A
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US2675072A
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US2741973A
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US2618331A
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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) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |