Patent US2477701A successfully refreshed from Google Patents.
US2510524A
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Apparatus for causing variable flow of air in treating rooms
Assignee: Individual
•
Filing: 1947-11-14
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Granted: 1950-06-06
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Expires: 1967-11-14
Abstract
No abstract record available.
Inventors
- 👤 Alex A Schramm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:19
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/04; F24F7/06; F24F7/08; F24F11/00; F24F11/70; F24F11/72; F24F11/74; F24F11/77; Y; Y02; Y02B; Y02B30/00; Y02B30/70
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1167844A
Cited
US1451747A
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US1599797A
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US1791498A
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US2006018A
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US2380428A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-05 | 1953-12-05 | 1954-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-05 | 1957-12-05 | 1958-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-05 | 1961-12-05 | 1962-06-06 | $7700.00 | Window Closed / Lapsed |