Patent US933681A successfully refreshed from Google Patents.
US933681A
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US
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Centrifugal pump.
Assignee: Individual
•
Filing: 1908-12-07
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Granted: 1909-09-07
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Expires: 1928-12-07
Abstract
No abstract record available.
Inventors
- 👤 James Valk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:27
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/18; F04D29/22; F04D29/2238; F04D29/225; F01; F01D; F01D17/00; F01D17/10; F01D17/12; F01D17/14; F01D17/16; F01D17/162; F04D15/00; F04D15/0005; F04D29/2255; F04D9/00; F04D9/001; F04D9/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1912-09-06 | 1913-03-08 | 1913-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1916-09-06 | 1917-03-08 | 1917-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1920-09-06 | 1921-03-08 | 1921-09-07 | $7700.00 | Window Closed / Lapsed |