Patent US3289923A successfully refreshed from Google Patents.
US3289923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-stage pump
Assignee: American Air Filter Co Inc
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Filing: 1964-10-30
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Granted: 1966-12-06
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Expires: 1984-10-30
Abstract
No abstract record available.
Inventors
- 👤 William V Millman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:49
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D1/00; F04D1/06; F04D1/063; F04D17/00; F04D17/08; F04D17/16; F04D17/164; F04D29/426; F04D29/4266
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A MULTI-STAGE PUMPING DEVICE COMPRISING: A RIGHT CYLINDRICAL OUTER CASING; AT LEAST ONE FLUID CONDUCTING STAGE IN SAID CASING, EACH STAGE INCLUDING MEANS DEFINING AN UPSTREAM PUMPING CHAMBER AND A DOWNSTREAM DIFFUSING CHAMBER; EACH PUMPING CHAMBER INCLUDING A FLUID IMPELLER COOPERATIVELY MOUNTED FOR ROTATION IN SAID PUMPING CHAMBER, A CENTRAL FLUID INLET DISPOSED TO CONDUCT FLUID TO SAID IMPELLER AND A VANE SPIRALLING RADIALLY OUTWARD ABOUT A PORTION OF THE PERIPHERY OF SAID IMPELLER AND FORMING A VOLUTE BETWEEN SAID VANE AND SAID OUTER CASING, SAID VANE TERMINATING IN A GENERALLY TANGENTIALLY DIRECTED PUMPING CHAMBER OUTLET ADJACENT THE PERIPHERY OF SAID IMPELLER; MEANS DEFINING AN UNOBSTRUCTED TRANSFER DUCT COMMU-
Claim 2
Dependent Claim
109 words
A MULTI-STAGE PUMPING DEVICE COMPRISING: A RIGHT CYLINDRICAL OUTER CASING; AT LEAST ONE FLUID CONDUCTING STAGE IN SAID CASING, EACH STAGE INCLUDING MEANS DEFINING AN UPSTREAM PUMPING CHAMBER AND A DOWNSTREAM DIFFUSING CHAMBER; EACH PUMPING CHAMBER INCLUDING A FLUID IMPELLER COOPERATIVELY MOUNTED FOR ROTATION IN SAID PUMPING CHAMBER, A CENTRAL FLUID INLET DISPOSED TO CONDUCT FLUID TO SAID IMPELLER AND A VANE SPIRALLING RADIALLY OUTWARD ABOUT A PORTION OF THE PERIPHERY OF SAID IMPELLER AND FORMING A VOLUTE BETWEEN SAID VANE AND SAID OUTER CASING, SAID VANE TERMINATING IN A GENERALLY TANGENTIALLY DIRECTED PUMPING CHAMBER OUTLET ADJACENT THE PERIPHERY OF SAID IMPELLER; MEANS DEFINING AN UNOBSTRUCTED TRANSFER DUCT COMMU-
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |