Alterable frequency response electrocardiographic amplifier
Patent 4494551 Issued on January 22, 1985. Estimated Expiration Date: 
November 12, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 12, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3087488 3534282 3569852 3579138 3581219 3667055 Selective interference filter Monitoring myoelectric signals Amplifier with dark current compensation His bundle cardiography InventorsAssigneeApplicationNo. 06/441175 filed on 11/12/1982US Classes:600/509, Detecting heartbeat electric signal128/901, SUPPRESSION OF NOISE IN ELECTRIC SIGNAL128/902, BIOLOGICAL SIGNAL AMPLIFIER327/553, Adjustable327/557, Bandpass330/107, Phase shift means in loop path330/294, Having frequency-responsive means or phase-shift means in feedback path330/85Amplifier in signal feedback pathExaminersPrimary: Kamm, William E.Assistant: Shein, Mitchell J. Attorney, Agent or FirmInternational ClassesA61B 5/04 (20060101)H03F 1/30 (20060101) H03F 1/26 (20060101) AbstractAn electrocardiographic amplifier having an integrator in the feedback loop between the amplifier's input and output whose time constant is varied by the duty cycle of a series switch to vary the low frequency 3 dB roll-off point as a function of the detected low frequency noise in the amplifier output signal. A capacitor is switched in parallel with the inverting feedback resistor to lower the high frequency 3 dB roll-off point in response to detected high frequency noise.Other References
Field of SearchPhase shift means in loop path | |
