Patent US3174553A successfully refreshed from Google Patents.
US3174553A
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US
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Reversible fan assembly
Assignee: Schwitzer Corp
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Filing: 1963-09-30
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Granted: 1965-03-23
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Expires: 1983-09-30
Abstract
No abstract record available.
Inventors
- 👤 Spears Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:09
CPC Classifications
F; F01; F01P; F01P7/00; F01P7/02; F01P7/06; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/34; F04D29/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1384672A
Cited
US1509601A
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US1479895A
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US1685323A
Cited
FR1189060A
Cited
US3026943A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-22 | 1968-09-21 | 1969-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-22 | 1972-09-21 | 1973-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-22 | 1976-09-21 | 1977-03-23 | $7700.00 | Window Closed / Lapsed |