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 ...

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 ...

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 ...