Patent US2583374A successfully refreshed from Google Patents.
US2583374A
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Exhaust fan
Assignee: HYDRAULIC SUPPLY Manufacturing Co
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Filing: 1950-10-18
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Granted: 1952-01-22
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Expires: 1970-10-18
Abstract
No abstract record available.
Inventors
- 👤 Frederick J Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:07
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/52; F04D29/522; F04D29/526; F04D25/00; F04D25/02; F04D25/08; F04D25/12; F04D25/14; F04F; F04F5/00; F04F5/14; F04F5/16; Y; Y10; Y10S; Y10S415/00; Y10S415/913
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-21 | 1955-07-23 | 1956-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-21 | 1959-07-23 | 1960-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-21 | 1963-07-23 | 1964-01-22 | $7700.00 | Window Closed / Lapsed |