1
Raymond D Chu, Anthony C Rubner, Marc A Bergman: Oxygen enriched reciprocating piston respirator. Lifecare Services, William C Cochran II, May 13, 1986: US04587967 (159 worldwide citation)

A variable flow reciprocating piston respirator system which is capable of providing a substantially constant oxygen enrichment over an entire inspiration stroke of a variable flow respirator output. A proportional control valve is used to deliver oxygen from an oxygen supply tank to the output of a ...


2
Raymond D Chu, Marc A Bergman: Pump for a portable ventilator. Lifecare Services, Burton & Dorr, January 15, 1985: US04493614 (151 worldwide citation)

A pump primarily intended for use in a portable ventilator. The pump includes a piston-cylinder arrangement in which the piston is reciprocally moved within the cylinder by rotating a shaft. The shaft is threaded and mounted for rotation within the cylinder at a fixed location along the axis of the ...


3
Raymond D Chu, Anthony C Rubner, Michael W Fellinger: Servo control system for a reciprocating piston respirator. Lifecare Services, William W Cochran II, October 14, 1986: US04617637 (130 worldwide citation)

A control system for moving a piston in a reciprocating piston respirator which utilizes predictive servo control techniques. Present invention uses nonlinear time domain analysis rather than linear frequency domain analysis to produce a predictive servo control system for precisely controlling the ...