US3396667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary pumps for viscous fluids
Assignee: Eisenwerke Kaiserslautern GmbH
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Filing: 1966-10-24
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Granted: 1968-08-13
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Expires: 1986-10-24
Abstract
No abstract record available.
Inventors
- 👤 Schmitt Armin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:26
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/12; F04C2/126; F04C2/082; F04C2/084; F05; F05C; F05C2225/00; F05C2225/04; Y; Y10; Y10S; Y10S417/00; Y10S417/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A ROTARY PUMP FOR CONVEYING VISCOUS FLUIDS OR SUSPENSIONS COMPRISING AN OVAL HOUSING HAVING AN INTAKE DUCT AND AN OUTLET DUCT, AN ENAMEL COATING ON THE INNER WALL OF SAID HOUSING, A PAIR OF PARALLEL SHAFTS ROTATABLY MOUNTED IN SAID HOUSING AND LATERALLY SPACED FROM EACH OTHER AND ADAPTED TO BE DRIVEN AT THE SAME SPEED IN OPPOSITE DIRECTIONS, AND A PAIR OF ROTORS CONSISTING OF A NONCORROSIVE AND WEAR-RESISTANT PLASTIC SECURED TO SAID SHAFTS WITHIN SAID HOUSING AND SERVING AS PUMP VANES, SAID SHAFTS ALSO SERVING AS CORES OF SAID ROTORS, EACH OF SAID ROTORS HAVING A SEGMENT-SHAPED CROSS SECTION AND A PAIR OF LONGITUDINAL WORKING SURFACES DETERMINING THE ANGLE OF THE SEGMENT, EACH OF SAID WORKING SURFACES HAVING A SUBSTANTIALLY S-SHAPED CROSS SECTION MERGING BY A CONTINUOUS CURVE WITH THE OUTER PERIPHERAL SURFACE OF SAID ROTOR AND SUBSTANTIALLY TANGENTIALLY WITH SAID CORE.
Claim 2
Dependent Claim
144 words
A ROTARY PUMP FOR CONVEYING VISCOUS FLUIDS OR SUSPENSIONS COMPRISING AN OVAL HOUSING HAVING AN INTAKE DUCT AND AN OUTLET DUCT, AN ENAMEL COATING ON THE INNER WALL OF SAID HOUSING, A PAIR OF PARALLEL SHAFTS ROTATABLY MOUNTED IN SAID HOUSING AND LATERALLY SPACED FROM EACH OTHER AND ADAPTED TO BE DRIVEN AT THE SAME SPEED IN OPPOSITE DIRECTIONS, AND A PAIR OF ROTORS CONSISTING OF A NONCORROSIVE AND WEAR-RESISTANT PLASTIC SECURED TO SAID SHAFTS WITHIN SAID HOUSING AND SERVING AS PUMP VANES, SAID SHAFTS ALSO SERVING AS CORES OF SAID ROTORS, EACH OF SAID ROTORS HAVING A SEGMENT-SHAPED CROSS SECTION AND A PAIR OF LONGITUDINAL WORKING SURFACES DETERMINING THE ANGLE OF THE SEGMENT, EACH OF SAID WORKING SURFACES HAVING A SUBSTANTIALLY S-SHAPED CROSS SECTION MERGING BY A CONTINUOUS CURVE WITH THE OUTER PERIPHERAL SURFACE OF SAID ROTOR AND SUBSTANTIALLY TANGENTIALLY WITH SAID CORE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-13 | 1972-02-12 | 1972-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-13 | 1976-02-12 | 1976-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-13 | 1980-02-12 | 1980-08-13 | $7700.00 | Window Closed / Lapsed |