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Patent US2816509A successfully refreshed from Google Patents.
US2816509A
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Submersible pumps
Assignee: DEMPSTER MILL Manufacturing Co
•
Filing: 1953-05-12
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Granted: 1957-12-17
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Expires: 1973-05-12
Abstract
No abstract record available.
Inventors
- 👤 Keith Q Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:49
CPC Classifications
F; F04; F04D; F04D13/00; F04D13/02; F04D13/06; F04D13/08; F04D13/10; Y; Y10; Y10S; Y10S415/00; Y10S415/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1662443A
Cited
GB228365A
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US2270666A
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US2245866A
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US2247813A
Cited
GB539373A
Cited
US2366964A
Cited
US2380606A
Cited
US2430509A
Cited
US2668068A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |