US3282495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing arrangement for screw-type compressors and similar devices
Assignee: Dresser Industries Inc
•
Filing: 1964-04-29
•
Granted: 1966-11-01
•
Expires: 1984-04-29
Abstract
No abstract record available.
Inventors
- 👤 Joseph D Walls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:52
CPC Classifications
F; F04; F04C; F04C18/00; F04C18/08; F04C18/082; F04C18/084; F04C18/12; F04C18/14; F04C18/16; F04C27/00; F04C27/001; F04C27/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
IN A FLUID HANDLING DEVICE OF THE TYPE HAVING A HOUSING PROVIDED WITH INTERSECTING CYLINDRICAL BORES AND SUCTION AND DISCHARGE PORTS ADJACENT THE OPPOSITE ENDS OF SAID HOUSING, A PAIR OF MATING HELICALLY THREADED ROTORS ROTATABLY SUPPORTED WITHIN SAID CYLINDRICAL BORES AND HAVING THREADS AND TROUGHS COOPERATING WITH EACH OTHER AND SAID HOUSING TO FORM POCKETS WHICH RECEIVE FLUID FROM THE SUCTION PORT, AXIALLY ADVANCE THE FLUID FROM THE SUCTION END TO THE DISCHARGE END OF THE HOUSING AND DISCHARGE THE FLUID THROUGH SAID DISCHARGE PORT AS THE ROTORS REVOLVE IN OPPOSITE DIRECTIONS ABOUT THE AXES THEREOF, THE IMPROVEMENT COMPRISING A FIRST LONGITUDINALLY EXTENDING CHANNEL IN THE PERIMETRIC SURFACE OF EACH THREAD OF SAID ROTORS, A PAIR OF LONGITUDINALLY EXTENDING CHANNELS ADJACENT SAID FIRST CHANNEL, SAID PAIR OF CHANNELS BEING DISPOSED IN OPPOSED RELATIONSHIP AND SPACED FROM THE PERIMETRIC SURFACE OF THE THREAD, EACH CHANNEL OF SAID PAIR OF CHANNELS OPENING INTO SAID FIRST CHANNEL TO FORM THEREWITH A SLOT SUBSTANTIALLY T-SHAPE IN CROSS-SECTION, A BACKING MEMBER
Claim 2
Dependent Claim
167 words
IN A FLUID HANDLING DEVICE OF THE TYPE HAVING A HOUSING PROVIDED WITH INTERSECTING CYLINDRICAL BORES AND SUCTION AND DISCHARGE PORTS ADJACENT THE OPPOSITE ENDS OF SAID HOUSING, A PAIR OF MATING HELICALLY THREADED ROTORS ROTATABLY SUPPORTED WITHIN SAID CYLINDRICAL BORES AND HAVING THREADS AND TROUGHS COOPERATING WITH EACH OTHER AND SAID HOUSING TO FORM POCKETS WHICH RECEIVE FLUID FROM THE SUCTION PORT, AXIALLY ADVANCE THE FLUID FROM THE SUCTION END TO THE DISCHARGE END OF THE HOUSING AND DISCHARGE THE FLUID THROUGH SAID DISCHARGE PORT AS THE ROTORS REVOLVE IN OPPOSITE DIRECTIONS ABOUT THE AXES THEREOF, THE IMPROVEMENT COMPRISING A FIRST LONGITUDINALLY EXTENDING CHANNEL IN THE PERIMETRIC SURFACE OF EACH THREAD OF SAID ROTORS, A PAIR OF LONGITUDINALLY EXTENDING CHANNELS ADJACENT SAID FIRST CHANNEL, SAID PAIR OF CHANNELS BEING DISPOSED IN OPPOSED RELATIONSHIP AND SPACED FROM THE PERIMETRIC SURFACE OF THE THREAD, EACH CHANNEL OF SAID PAIR OF CHANNELS OPENING INTO SAID FIRST CHANNEL TO FORM THEREWITH A SLOT SUBSTANTIALLY T-SHAPE IN CROSS-SECTION, A BACKING MEMBER
References Cited (Backward Citations)
GB134073A
Cited
US1497239A
Cited
US1698802A
Cited
US2266820A
Cited
US2622787A
Cited
GB793886A
Cited
US3068016A
Cited
US3083975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |