Pumps – Condition responsive control of pump drive motor – With condition responsive control of pump fluid valve
Reexamination Certificate
2003-03-20
2010-06-08
Cuff, Michael (Department: 3741)
Pumps
Condition responsive control of pump drive motor
With condition responsive control of pump fluid valve
C417S044100, C417S044110
Reexamination Certificate
active
07731484
ABSTRACT:
The present invention has an object of controlling power consumption by a vacuum pump by varying the number of revolutions of the vacuum pump in accordance with the operating state of a vacuum device.The condition setting part4sets the relationship between the operating state of the vacuum device10and the rotational speed of the vacuum pump2that evacuates the vacuum device10. This relationship is set to an appropriate value so as to prevent the rotational speed of the vacuum pump2from becoming a higher rotational speed than is required. The control part6, to which external signals S1through Sn corresponding to the operating state of the vacuum device10are input, reads out from the condition setting part4and outputs the rotational speed of the vacuum pump2corresponding to the external signals. The inverter8controls the rotational speed of the vacuum pump based on the output of the control part6.
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Dec. 14, 2005 official Communication and Supplementary European Search Report in connection with European Appl. No. EP 03 71 2801.
Tsuji Kohji
Yamamoto Hidemi
Cooper & Dunham LLP
Cuff Michael
Dwivedi Vikansha S
Ricoh & Company, Ltd.
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