Patent US3340813A successfully refreshed from Google Patents.
US3340813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal pumps
Assignee: TDK Micronas GmbH
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Filing: 1965-06-11
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Granted: 1967-09-12
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Expires: 1985-06-11
Abstract
No abstract record available.
Inventors
- 👤 Keyes Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:33
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/18; F04D29/22; F04D29/2261; F04D29/2266; F04D29/08; F04D29/10; F04D29/12; F04D29/126; F04D29/128; G; G04; G04B; G04B11/00; G04B11/02; G04B11/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
IN A CENTRIFUGAL PUMP, SAID PUMP INCLUDING A CASING HAVING A LIQUID INLET LEADING TO A SUCTION PASSAGE AND A PRESSURE CHAMBER LEADING TO A LIQUID OUTLET, SAID CASING HAVING WALL STRUCTURE BORDERING AND DEFINING A SEAL CAVITY COMMUNICATING WITH SAID PRESSURE CHAMBER, WITH SAID WALL STRUCTURE HAVING A CENTRAL SHAFT OPENING, A ROTATABLE SHAFT PROJECTING THROUGH SAID OPENING AND SEAL CAVITY AND CARRYING AN IMPELLER FOR ROTATION IN SAID CASING TO DRAW LIQUID THROUGH SAID SUCTION PASSAGE AND DISCHARGE IT INTO SAID PRESSURE CHAMBER, A SEAL ASSEMBLY IN SAID SEAL CAVITY INCLUDING ROTATABLE SEAL RING MEANS ENCIRCLING SAID SHAFT TO PROVIDE A SEAL ACROSS SAID CENTRAL SHAFT OPENING OF SAID WALL STRUCTURE, AND SAID IMPELLER COMPRISING REAR SHROUD MEANS FOR FORMING A PASSAGEWAY THROUGH WHICH SAID LIQUID IN SAID SEAL CAVITY IS FORCIBLY CIRCULATED CONTIGUOUS TO SAID SEAL RING MEANS, SAID PASSAGEWAY EXTENDING OVER SAID SEAL ASSEMBLY TO THE PRESSURE CHAMBER.
Claim 2
Dependent Claim
152 words
IN A CENTRIFUGAL PUMP, SAID PUMP INCLUDING A CASING HAVING A LIQUID INLET LEADING TO A SUCTION PASSAGE AND A PRESSURE CHAMBER LEADING TO A LIQUID OUTLET, SAID CASING HAVING WALL STRUCTURE BORDERING AND DEFINING A SEAL CAVITY COMMUNICATING WITH SAID PRESSURE CHAMBER, WITH SAID WALL STRUCTURE HAVING A CENTRAL SHAFT OPENING, A ROTATABLE SHAFT PROJECTING THROUGH SAID OPENING AND SEAL CAVITY AND CARRYING AN IMPELLER FOR ROTATION IN SAID CASING TO DRAW LIQUID THROUGH SAID SUCTION PASSAGE AND DISCHARGE IT INTO SAID PRESSURE CHAMBER, A SEAL ASSEMBLY IN SAID SEAL CAVITY INCLUDING ROTATABLE SEAL RING MEANS ENCIRCLING SAID SHAFT TO PROVIDE A SEAL ACROSS SAID CENTRAL SHAFT OPENING OF SAID WALL STRUCTURE, AND SAID IMPELLER COMPRISING REAR SHROUD MEANS FOR FORMING A PASSAGEWAY THROUGH WHICH SAID LIQUID IN SAID SEAL CAVITY IS FORCIBLY CIRCULATED CONTIGUOUS TO SAID SEAL RING MEANS, SAID PASSAGEWAY EXTENDING OVER SAID SEAL ASSEMBLY TO THE PRESSURE CHAMBER.
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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) | 1970-09-11 | 1971-03-13 | 1971-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-11 | 1975-03-13 | 1975-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-11 | 1979-03-13 | 1979-09-12 | $7700.00 | Window Closed / Lapsed |