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| Number | Title | Issue Date |
| 4289141 | Method and apparatus for extracting systolic valvular events from heart sounds A non-invasive method and means for determining beat-by-beat assessments of a patient's cardiac performance by measuring the "pre-ejection phase" (PEP) and the "left ventricular ejection time" (LVET), the aforementioned phrases also being known as the "sy... | 09/15/1981 |
| 4094308 | Method and system for rapid non-invasive determination of the systolic time intervals A non-invasive method and means for determining beat-by-beat assessments of a patient's cardiac performance by measuring the "pre-ejection phase" (PEP) and the "left ventricular ejection time" (LVET), the aforementioned phrases also being known as the "sy... | 06/13/1978 |
