Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2007-09-18
2007-09-18
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C363S074000, C363S078000
Reexamination Certificate
active
10670036
ABSTRACT:
A loop powered process instrument comprises a control circuit measuring a process variable and developing a control signal representing the process variable. An output circuit for connection to a two-wire process loop controls current on the loop in accordance with the control signal. A power supply circuit is connected to the output circuit and the control circuit for receiving power from the two-wire process loop and supplying power to the control circuit. The power supply comprises cascaded charge pump circuits.
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patent: 5610552 (1997-03-01), Schlesinger et al.
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patent: 6650555 (2003-11-01), Suzuki et al.
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patent: 7046180 (2006-05-01), Jongsma et al.
Englund Terry L.
Magnetrol International Inc.
Wells Kenneth B.
Wood Phillips Katz Clark & Mortimer
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