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Patent US2640412A successfully refreshed from Google Patents.
US2640412A
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Adjustable grille
Assignee: Schneider Electric Buildings Americas Inc
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Filing: 1949-02-24
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Granted: 1953-06-02
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Expires: 1969-02-24
Abstract
No abstract record available.
Inventors
- 👤 Russell P Sweger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:45
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US79817A
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US833554A
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US1754961A
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US1872794A
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US1967552A
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US2053393A
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US2189502A
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GB501926A
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US2906749A
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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) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |