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| Number | Title | Issue Date |
| 4515164 | Differential doppler for blood flow measurement A portable apparatus for determining the degree of occlusion in a blood vessel. The apparatus includes a transmitter for producing an ultrasonic signal, a first probe for directing the ultrasonic signal to a first location in a blood vessel and a second p... | 05/07/1985 |
| 4489610 | Computerized audiometer A computerized audiometer is provided with at least one head set, a control switch, a tone generator for providing a plurality of sequential tones of different frequencies and amplifications to at least one head set, and a central processing unit for rece... | 12/25/1984 |
| 4483346 | Electrocardiograph with digitally-printing waveform display An electrocardiograph included microprocessor control of signals not only from conventional electrocardiograph electrodes but also from a phonocardiographic pickup. The signals are multiplexed, converted to digital representations for processing and are d... | 11/20/1984 |
| 4438772 | Differential stethoscope A portable differential stethoscope includes small microphone elements which are attached to the stethoscope heads to pick up acoustic signals from the body. The sounds picked up by the stethoscope heads include body noise signals as well as heartbeat sig... | 03/27/1984 |
