Patent US2422560A successfully refreshed from Google Patents.
US2422560A
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Cold air and recirculated air mixing and distributing means in an overhead air conditioning duct system
Assignee: BF Sturtevant Co
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Filing: 1944-08-19
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Granted: 1947-06-17
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Expires: 1964-08-19
Abstract
No abstract record available.
Inventors
- 👤 Robert T Palmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:25
CPC Classifications
B; B61; B61D; B61D27/00; B61D27/009
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE253487C
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US845047A
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US1150540A
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US1550714A
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US1754961A
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US2220587A
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US2286252A
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US2275295A
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US2340252A
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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) | 1950-06-16 | 1950-12-16 | 1951-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-16 | 1954-12-16 | 1955-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-16 | 1958-12-16 | 1959-06-17 | $7700.00 | Window Closed / Lapsed |