Patent US3537659A successfully refreshed from Google Patents.
US3537659A
Expired / Lapsed
US
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Chopper impeller pump with agitation auger
Assignee: Avco Corp
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Filing: 1969-03-17
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Granted: 1970-11-03
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Expires: 1989-03-17
Abstract
No abstract record available.
Inventors
- 👤 Lawrence J Vagedes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:17
CPC Classifications
A; A01; A01C; A01C3/00; A01C3/02; A01C3/026; B; B01; B01F; B01F25/00; B01F25/20; B01F25/21; B01F27/00; B01F27/21; B01F27/2123; B01F27/80; B01F27/81; B01F27/811; B01F27/8111; B01F35/00; B01F35/75; B01F35/752; B01F35/753; B01F27/05; B01F27/11; B01F27/111; B01F27/114; B01F27/1144; B01F27/19; B01F27/192
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2480998A
Cited
US2714354A
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US2975714A
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US2796006A
Cited
US3319896A
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US3417929A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |