US3103894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw pump
Assignee: IMO Industries Inc
•
Filing: 1960-02-18
•
Granted: 1963-09-17
•
Expires: 1980-02-18
Abstract
No abstract record available.
Inventors
- 👤 Morgan B Sennet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:05
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/12; F04C2/14; F04C2/16; F04C2/165
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
216 words
A LIQUID SCREW PUMP OF THE TYPE COMPRISING AN ASSEMBLAGE OF INTERMESHING ROTARY SCREWS INCLUDING A MIDDLE SCREW HAVING AT LEAST ONE THREAD WITH CONVEX FLANKS HAVING PERIPHERAL EDGE PORTIONS AT JUNCTIONS WITH CYLINDRICAL OUTERMOST PORTIONS OF SAID THREAD, AND HAVING AT LEAST ONE SIDE SCREW HAVING THREADS WITH CONCAVE FLANKS HAVING PERIPHERAL EDGE PORTIONS AT JUNCTIONS WITH CYLINDRICAL OUTERMOST PORTIONS OF THE LAST MENTIONED THREADS, THE RESPECTIVE THREADS BEING ARRANGED TO APPROXIMATELY SEAL AGAINST THE COOPERATING SCREWS, AND THE ASSEMBLAGE OF SCREWS BEING SEALINGLY ENCLOSED BY CYLINDRICAL WALLS OF A CASING SUBSTANTIALLY CONTACTING SAID CYLINDRICAL OUTERMOST PORTIONS OF THE THREADS OF SAID SCREWS, WHICH CASING PROVIDES FREE CONTINUOUS LIQUID COMMUNICATION BETWEEN THE ENDS OF THE CASING AND THE ENDS OF SAID SCREWS, THE SCREWS AND THE ASSEMBLAGE BEING SUCH THAT IN EVERY POSITION OF SAID SCREWS AT LEAST ONE SUBSTANTIALLY CLOSED CHAMBER IS FORMED BY THE THREADS, THE TROUGHS BETWEEN THE THREADS, AND THE CYLINDRICAL WALLS OF THE CASING, WHICH CHAMBER DURING ROTATION OF THE SCREWS TRAVELS AXIALLY WITH MAINTENANCE OF A SUBSTANTIALLY CONSTANT VOLUME FROM THE INLET TO THE OUTLET OF THE SCREW ASSEMBLAGE, CHARACTERIZED IN THAT EACH OF SAID THREAD FLANKS IS ESSENTIALLY OF A FORM GEOMETRICALLY GENERATED, EXCEPT FOR RUNNING CLEARANCES, BY THE PERIPHERAL EDGE PORTIONS OF THE FLANK OF AN ADJACENT
Claim 2
Dependent Claim
216 words
A LIQUID SCREW PUMP OF THE TYPE COMPRISING AN ASSEMBLAGE OF INTERMESHING ROTARY SCREWS INCLUDING A MIDDLE SCREW HAVING AT LEAST ONE THREAD WITH CONVEX FLANKS HAVING PERIPHERAL EDGE PORTIONS AT JUNCTIONS WITH CYLINDRICAL OUTERMOST PORTIONS OF SAID THREAD, AND HAVING AT LEAST ONE SIDE SCREW HAVING THREADS WITH CONCAVE FLANKS HAVING PERIPHERAL EDGE PORTIONS AT JUNCTIONS WITH CYLINDRICAL OUTERMOST PORTIONS OF THE LAST MENTIONED THREADS, THE RESPECTIVE THREADS BEING ARRANGED TO APPROXIMATELY SEAL AGAINST THE COOPERATING SCREWS, AND THE ASSEMBLAGE OF SCREWS BEING SEALINGLY ENCLOSED BY CYLINDRICAL WALLS OF A CASING SUBSTANTIALLY CONTACTING SAID CYLINDRICAL OUTERMOST PORTIONS OF THE THREADS OF SAID SCREWS, WHICH CASING PROVIDES FREE CONTINUOUS LIQUID COMMUNICATION BETWEEN THE ENDS OF THE CASING AND THE ENDS OF SAID SCREWS, THE SCREWS AND THE ASSEMBLAGE BEING SUCH THAT IN EVERY POSITION OF SAID SCREWS AT LEAST ONE SUBSTANTIALLY CLOSED CHAMBER IS FORMED BY THE THREADS, THE TROUGHS BETWEEN THE THREADS, AND THE CYLINDRICAL WALLS OF THE CASING, WHICH CHAMBER DURING ROTATION OF THE SCREWS TRAVELS AXIALLY WITH MAINTENANCE OF A SUBSTANTIALLY CONSTANT VOLUME FROM THE INLET TO THE OUTLET OF THE SCREW ASSEMBLAGE, CHARACTERIZED IN THAT EACH OF SAID THREAD FLANKS IS ESSENTIALLY OF A FORM GEOMETRICALLY GENERATED, EXCEPT FOR RUNNING CLEARANCES, BY THE PERIPHERAL EDGE PORTIONS OF THE FLANK OF AN ADJACENT
References Cited (Backward Citations)
US1698802A
Cited
US1965557A
Cited
US1821523A
Cited
US2198786A
Cited
US2174522A
Cited
US2289371A
Cited
US2287716A
Cited
US2457314A
Cited
US2473234A
Cited
US2620968A
Cited
US2486770A
Cited
US2622787A
Cited
US2901164A
Cited
US2693763A
Cited
GB753275A
Cited
US2952216A
Cited
US2931308A
Cited
US2922377A
Cited
US2982221A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-09-16 | 1967-03-18 | 1967-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-16 | 1971-03-18 | 1971-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-16 | 1975-03-18 | 1975-09-17 | $7700.00 | Window Closed / Lapsed |