Screw pump
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Sep 27, 1988
Grant Date -
N/A
app pub date -
Jun 23, 1986
filing date -
Jun 24, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A screw pump including a screw assembly in a sleeve, the assembly comprising a drive screw having protruding threaded sides, and multiple driven screws having concave threaded sides which are closely meshed with the drive screw, thus forming a series of sealed chamber. The screw pump further includes one or more channels which are formed in the circumferential direction around the periphery of the driven screws, so that the final sealed chamber adjacent a discharge port of the pump partially communicates with the port through the channels shortly before the chamber completely opens to the port.
First Claim
Other Claims data not available
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| Country | kind | publication No. | Filing Date |
|---|---|---|---|
| JP | A | JPS61294178 | Jun 24, 1985 |
| EP | B1 | EP0209984 | Jun 20, 1986 |
International Classification(s)
- 1986 Application Filing Year
- F04C Class
- 107 Applications Filed
- 0 Patents Issued To-Date
- 0 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 8 Citation Count
- F04C Class
- 0 % this patent is cited more than
- 37 Age