Minnesota Mining and Manufacturing Company

Michael J Rude

Hatim M Carim

Orlin Bruce Knudson

David P Erickson

William J Kelliher, Jr

Bruce P Ekholm

John E Nelson

Samuel H Tao

A method and apparatus for the direct noninvasive prediction of hematocrit in mammalian blood using photoplethysmography techniques and data processing. The method and apparatus also include optional prediction of other analytes of interest: percent oxygen saturation of mammalian blood and methemoglobin of stored blood. The method and apparatus can be used for the immediate, periodic, or continuous noninvasive diagnosis or monitoring of hematocrit levels in mammalian patients without pain to the patient or exposure of the health care practitioner to the blood of the patient.

Method and apparatus for noninvasive prediction of hematocrit

An electronic article surveillance (EAS) systems includes an asynchronous noise suppression adaptive filter which removes asynchronous interference from the signal of interest with minimum distortion of the transients emitted when a sensitized tag is interrogated. The system also includes a synchronous noise suppression filter which removes interrogation synchronous noise from the signal of interest. The resulting EAS system increases the likelihood that a sensitized tag will be detected when one is present and reduces the occurrence of false alarms.

Electronic article surveillance system with adaptive filtering and

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Saint Paul, MN, United States of America

Michael J Rude