A-Dec, Inc.

Psytech, Inc.

Robert L Sickler

George K Austin, Jr

Ronald A Rolleston, Ii

Robert E Holden

The front panel of a control panel is provided with a recess for receiving a keypad. The recess is larger than the keypad to define a channel between the edges of the keypad and the sides of the recess. A sealant fills the channel to provide a smooth transition between the front panel and the keypad that protects the edges of the keypad and prevents the entry of moisture and debris into the channel. The control panel can be assembled by fixing the keypad within the recess, placing a temporary barrier over the top surface of the channel, and introducing the sealant into the channel. The sealant can be introduced through one or more ports in either the front panel or the temporary barrier. The temporary barrier is removed when the sealant hardens within the channel.

Control panel with sealed switch keypad

The heart rate of a subject during strenuous physical exercise is monitored accurately by feeding the plurality of electric signals of diverse amplitudes generated by transducers engaging the skin of the subject, to a variably controlled gain amplifier to adjust the amplitudes to within a predetermined amplitude range, feeding the adjusted amplitude signals to a slew rate filter formed of a pair of slew rate limiters to compare the slew rates of the adjusted signals, feeding the compared signals to a slew rate limit comparator to separate from the QRS waveforms representing heartbeat of the subject those interfering electric signals having slew rates outside the range of slew rates representing QRS waveforms, and monitoring the QRS waveforms. The separation of interfering signals is achieved with minimum complexity of electronic circuitry and correspondingly reduced cost, by feeding the compared signals also to a microprocessor programmed to recognize as interfering signals those waveforms that have slew rates similar to those of the QRS waveforms but originating as waveforms of substantially greater amplitude and/or of an occurrence rate differing from the uniform recurrence rate of QRS waveforms.

Method and apparatus for distinguishing electric signal waveforms

The service life of a lamp used with a dental handpiece light is enhanced by the brightness control system, which provides a reduced lamp intensity during the time the handpiece is moved from its holder. The control system increases the lamp to its full intensity when the handpiece is actuated.

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Aloha, OR, United States of America

Robert L Sickler