Patent US2530173A successfully refreshed from Google Patents.
US2530173A
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US
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Helical interengaging impellers blower
Assignee: Eaton Corp
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Filing: 1947-07-25
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Granted: 1950-11-14
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Expires: 1967-07-25
Abstract
No abstract record available.
Inventors
- 👤 Oldberg Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:48
CPC Classifications
F; F04; F04C; F04C18/00; F04C18/08; F04C18/082; F04C18/084; F04C18/12; F04C18/14; F04C18/16; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19949; Y10T74/19963; Y10T74/19972; Y10T74/19986
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1194904A
Cited
US1319776A
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DE75506C
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US1004776A
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US2078334A
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US2287716A
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US2382042A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-13 | 1954-05-15 | 1954-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-13 | 1958-05-15 | 1958-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-13 | 1962-05-15 | 1962-11-14 | $7700.00 | Window Closed / Lapsed |