Patent US2753585A successfully refreshed from Google Patents.
US3104615A
Expired / Lapsed
US
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Worm pump
Assignee: Erich Netzsch GmbH and Co Holding KG
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Filing: 1960-10-07
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Granted: 1963-09-24
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Expires: 1980-10-07
Abstract
No abstract record available.
Inventors
- 👤 Szegvari Andrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:08
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/10; F04C2/107; F04C2/1071; F04C2/1073
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A WORM PUMP COMPRISING: A HOUSING HAVING AN INLET AND AN OUTLET THEREIN; A STATOR SLIDABLY POSITIONED IN SAID HOUSING FOR AXIAL MOVEMENT RELATIVE THERETO AND HAVING INTERNAL HELICAL THREADS, MEANS BETWEEN SAID STATOR AND SAID HOUSING FOR BLOCKING ROTATION THEREBETWEEN; A ROTOR POSITIONED WITHIN SAID STATOR AND HAVING EXTERNAL HELICAL THREADS OF DIFFERENT NUMBER THAN SAID INTERNAL THREADS FOR COACTING WITH SAID INTERNAL THREADS TO PROVIDE A PUMPING CHAMBER THEREBETWEEN WHICH PROGRESSES ALONG THE AXIS OF THE ROTOR UPON ROTATION OF THE ROTOR, SAID STATOR AND ROTOR THREADS BEING TAPERED FROM ONE END OF THE PUMP TO THE OTHER TO DEFINE A FRUSTO-CONICAL CONTACT SURFACE THEREBETWEEN, AND MEANS ACCESSIBLE THROUGH SAID HOUSING FOR MOVING SAID STATOR AXIALLY OF SAID ROTOR TO ADJUST THE CONTACT PRESSURE BETWEEN THE ROTOR AND STATOR THREADS.
Claim 2
Dependent Claim
132 words
A WORM PUMP COMPRISING: A HOUSING HAVING AN INLET AND AN OUTLET THEREIN; A STATOR SLIDABLY POSITIONED IN SAID HOUSING FOR AXIAL MOVEMENT RELATIVE THERETO AND HAVING INTERNAL HELICAL THREADS, MEANS BETWEEN SAID STATOR AND SAID HOUSING FOR BLOCKING ROTATION THEREBETWEEN; A ROTOR POSITIONED WITHIN SAID STATOR AND HAVING EXTERNAL HELICAL THREADS OF DIFFERENT NUMBER THAN SAID INTERNAL THREADS FOR COACTING WITH SAID INTERNAL THREADS TO PROVIDE A PUMPING CHAMBER THEREBETWEEN WHICH PROGRESSES ALONG THE AXIS OF THE ROTOR UPON ROTATION OF THE ROTOR, SAID STATOR AND ROTOR THREADS BEING TAPERED FROM ONE END OF THE PUMP TO THE OTHER TO DEFINE A FRUSTO-CONICAL CONTACT SURFACE THEREBETWEEN, AND MEANS ACCESSIBLE THROUGH SAID HOUSING FOR MOVING SAID STATOR AXIALLY OF SAID ROTOR TO ADJUST THE CONTACT PRESSURE BETWEEN THE ROTOR AND STATOR THREADS.
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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) | 1966-09-23 | 1967-03-25 | 1967-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-23 | 1971-03-25 | 1971-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-23 | 1975-03-25 | 1975-09-24 | $7700.00 | Window Closed / Lapsed |