Patent US2594944A successfully refreshed from Google Patents.
US2594944A
Expired / Lapsed
US
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Automatic ventilating shutter
Assignee: Chelsea Products Inc
•
Filing: 1948-12-15
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Granted: 1952-04-29
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Expires: 1968-12-15
Abstract
No abstract record available.
Inventors
- 👤 Jr William J Lohman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:16
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08; F24F13/10; F24F13/14; F24F13/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US158630A
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GB190412742A
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US1424410A
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DE574975C
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US2103982A
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US2060289A
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US2061162A
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US2135810A
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US2191774A
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US2314003A
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US2323178A
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US2295239A
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US2355412A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-29 | 1955-10-29 | 1956-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-29 | 1959-10-29 | 1960-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-29 | 1963-10-29 | 1964-04-29 | $7700.00 | Window Closed / Lapsed |