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Patent US3491696A successfully refreshed from Google Patents.
US3491696A
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Centrifugal pump
Assignee: HENRY H HOWARD
•
Filing: 1968-10-11
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Granted: 1970-01-27
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Expires: 1988-10-11
Abstract
No abstract record available.
Inventors
- 👤 Henry H Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:01
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/60; F04D29/62; F04D29/628; F04D29/18; F04D29/22; F04D29/2238
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US897397A
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US1514293A
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US1763595A
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US2407748A
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US2784673A
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US2880676A
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US2903971A
Cited
US3295456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-26 | 1973-07-28 | 1974-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-26 | 1977-07-28 | 1978-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-26 | 1981-07-28 | 1982-01-27 | $7700.00 | Window Closed / Lapsed |