1
Eyrick Theodore B, Brown Allen C, Hattes Neil R: Volume-rate respirator system and method. Chemetron Corporation, Jones Tullar & Cooper, September 16, 1975: US3905362 (81 worldwide citation)

A respiration unit for supplying a preselected limited volume of breathing gas to a patient at limited positive pressures, and at a preselected limited flow rate is disclosed. The system includes an air delivery cylinder having a drive weight which is free to move up and down. A diaphragm connected ...


2
Hattes Neil R: Respiration monitoring method and apparatus. Chemetron Corporation, Jones Tullar & Cooper, October 14, 1975: US3911899 (42 worldwide citation)

Circuitry for measuring and displaying periodically occurring physiological parameters such as the breathing rate of a patient and for providing an alarm upon the occurrence of abnormal rates is disclosed. Patient breathing is detected by variations in the distance between transmsitter and receiver ...


3
Eyrick Theodore B, Hattes Neil R: Respiration ratemeter. Chemetron Corporation, Jones Tuller & Cooper, June 3, 1975: US3887795 (4 worldwide citation)

Circuitry for displaying an averaged respiration rate is disclosed. Inspiration pulses from a respirator representing a breathing rate to be monitored are fed to three counters, each of which counts the pulses for a period of 30 seconds. Each 10 seconds the accumulated count in a different counter i ...


4