Patent US3146723A successfully refreshed from Google Patents.
US3146723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw pump unit
Assignee: Individual
•
Filing: 1959-04-13
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Granted: 1964-09-01
•
Expires: 1979-04-13
Abstract
No abstract record available.
Inventors
- 👤 Wildhaber Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:22
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/12; F04C2/14; F04C2/16; F04C2/165; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19642; Y10T74/19647
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
A SCREW PUMP UNIT CONTAINING A BASE, A SCREW PUMP AND MOTOR RIGIDLY MOUNTED ON SAID BASE, SAID PUMP COMPRISING AT LEAST A PAIR OF INTERENGAGING SCREWS ROTATABLE ON PARALLEL AXES FOR DISPLACING FLUID AXIALLY OF SAID SCREWS FROM AN INLET SIDE TO A DISCHARGE SIDE, AN INTERNAL GEAR REMOVABLY SECURED TO ONE OF SAID SCREWS, DISCONNECTABLE MEANS FOR CONNECTING SAID INTERNAL GEAR WITH SAID ONE SCREW AND PERMITTING DISCONNECTION OF SAID INTERNAL GEAR FROM SAID ONE SCREW WITHOUT DISPLACING SAID PUMP AND MOTOR ON THEIR BASE, SAID MOTOR HAVING A SHAFT PARALLEL TO THE AXES OF SAID SCREWS, A PINION RIGIDLY SECURED TO THE SHAFT OF SAID MOTOR, SAID PINION MESHING WITH SAID INTERNAL GEAR AND FORMING A REDUCTION PAIR OF OTHER THAN ONE TO ONE AND OF LESS THAN TWO TO ONE RATIO THEREWITH, THE TEETH OF AT LEAST ONE MEMBER OF SAID PAIR BEING CROWNED LONGITUDINALLY TO PERMIT MODERATE MISALIGNMENT BETWEEN THE DIRECTIONS OF THE AXES OF SAID ONE SCREW AND OF SAID PINION WITHOUT A FLEXIBLE COUPLING CONNECTION.
Claim 2
Dependent Claim
172 words
A SCREW PUMP UNIT CONTAINING A BASE, A SCREW PUMP AND MOTOR RIGIDLY MOUNTED ON SAID BASE, SAID PUMP COMPRISING AT LEAST A PAIR OF INTERENGAGING SCREWS ROTATABLE ON PARALLEL AXES FOR DISPLACING FLUID AXIALLY OF SAID SCREWS FROM AN INLET SIDE TO A DISCHARGE SIDE, AN INTERNAL GEAR REMOVABLY SECURED TO ONE OF SAID SCREWS, DISCONNECTABLE MEANS FOR CONNECTING SAID INTERNAL GEAR WITH SAID ONE SCREW AND PERMITTING DISCONNECTION OF SAID INTERNAL GEAR FROM SAID ONE SCREW WITHOUT DISPLACING SAID PUMP AND MOTOR ON THEIR BASE, SAID MOTOR HAVING A SHAFT PARALLEL TO THE AXES OF SAID SCREWS, A PINION RIGIDLY SECURED TO THE SHAFT OF SAID MOTOR, SAID PINION MESHING WITH SAID INTERNAL GEAR AND FORMING A REDUCTION PAIR OF OTHER THAN ONE TO ONE AND OF LESS THAN TWO TO ONE RATIO THEREWITH, THE TEETH OF AT LEAST ONE MEMBER OF SAID PAIR BEING CROWNED LONGITUDINALLY TO PERMIT MODERATE MISALIGNMENT BETWEEN THE DIRECTIONS OF THE AXES OF SAID ONE SCREW AND OF SAID PINION WITHOUT A FLEXIBLE COUPLING CONNECTION.
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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) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |