Patent US3430921A successfully refreshed from Google Patents.
US3430921A
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US
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Fluid impeller apparatus
Assignee: Individual
•
Filing: 1966-07-25
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Granted: 1969-03-04
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Expires: 1986-07-25
Abstract
No abstract record available.
Inventors
- 👤 Robert B Dewey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:57
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/18; F04D29/22; F04D29/2205; F04D29/2211; F03; F03B; F03B3/00; F03B3/10; F04D1/00; F04D1/06; F04D1/10; Y; Y02; Y02E; Y02E10/00; Y02E10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE343982C
Cited
FR503510A
Cited
US2537344A
Cited
FR1003735A
Cited
FR1237157A
Cited
FR76030E
Cited
US3103325A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-03 | 1972-09-02 | 1973-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-03 | 1976-09-02 | 1977-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-03 | 1980-09-02 | 1981-03-04 | $7700.00 | Window Closed / Lapsed |