Pumps – Condition responsive control of pump drive motor – By control of electric or magnetic drive motor
Reexamination Certificate
2005-02-22
2005-02-22
Freay, Charles G. (Department: 3746)
Pumps
Condition responsive control of pump drive motor
By control of electric or magnetic drive motor
C417S063000, C417S415000
Reexamination Certificate
active
06857857
ABSTRACT:
A reciprocating machine such as a vacuum pump includes a cylinder in which a reciprocating piston is disposed for reciprocating movement. A variable voltage driver is provided for driving the piston and a vibration sensor is provided for sensing contact between the piston and ends of the cylinder. A controller interconnects the sensor and driver to control movement of the driver and piston to maximize piston stroke and reduce if not eliminate contacting of the piston with the cylinder.
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Database WPI, Section PQ, Week 200020, Derwent Publications Ltd., London, GB; Class Q56, AN 2000-224962, XP002238999 & BR 9 901 136 A (LG Electronics Inc), Jan. 11, 2000 *abstract*.
Declaration of Stephen Dovey.
Declaration of Carl Watkinson.
Declaration of David Steele.
Dovey Stephen J.
Shelley Gerald R.
Stones Ian D.
Cheung Wan Yee
Cohen Joshua L.
Freay Charles G.
The BOC Group plc
Zebrak Ira Lee
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