Inventor
LONGSDORF RANDY J
US11 patents
Patents
11 patentsUS7018800B2Mar 28, 2006
Process device with quiescent current diagnostics
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US6006338ADec 21, 1999
Process transmitter communication circuit
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US5710552AJan 20, 1998
Barrier device
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US7280048B2Oct 9, 2007
Process control loop current verification
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US5323289AJun 21, 1994
Lightning protection for field mounted instruments
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US4804958AFeb 14, 1989
Two-wire transmitter with threshold detection circuit
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US7321846B1Jan 22, 2008
Two-wire process control loop diagnostics
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US5847567ADec 8, 1998
Microwave level gauge with remote transducer
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US5410730AApr 25, 1995
Interface controller for matching a process address field from a plurality of fields and generating a corresponding device address field
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US7627441B2Dec 1, 2009
Process device with vibration based diagnostics
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US7630861B2Dec 8, 2009
Dedicated process diagnostic device
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