US2780176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal impellers
Assignee: MW Kellogg Co
•
Filing: 1951-02-28
•
Granted: 1957-02-05
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Expires: 1971-02-28
Abstract
No abstract record available.
Inventors
- 👤 Hans T Holzwarth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:13
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/18; F04D29/22; F04D29/24; F04D29/247; F04D29/2205; F04D29/2222; F04D29/2227; F05; F05D; F05D2300/00; F05D2300/40; F05D2300/43; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49329; Y10T29/49826; Y10T29/49861
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1032287A
Cited
US1347327A
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US1825622A
Cited
GB279325A
Cited
US1967182A
Cited
US2293765A
Cited
US2503025A
Cited
US2486619A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-05 | 1960-08-06 | 1961-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-05 | 1964-08-06 | 1965-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-05 | 1968-08-06 | 1969-02-05 | $7700.00 | Window Closed / Lapsed |