Abstract: A respiratory exerciser having the features of being fabricated from cardboard and plastic stamped parts which are glued together and which fold up into a compact box for ease of storage including stowage of the connecting hose and mouthpiece inside the box. Many different forms, variations and optional features are also provided.

Abstract: A machine for concentrating the oxygen in air, especially for medical purposes utilizing a pressure swing adsorption (PSA) technique. The machine includes a combination of features to provide an extremely light weight reliable and compact device, which operates at a low noise level, and is especially suited for home use.

Abstract: An improved pressure swing adsorption device built using a modular concept and comprising a surge tank unit and a combined bed and control unit, each of those units being separately replaceable and separately usable. The valves and other controls are constructed in a modular manner and fit onto the beds such that they are readily and easily replaced without dissembling the entire control apparatus. Numerous other features and advantages are provided to all together produce a highly reliable easily serviceable and relatively low cost to manufacture device.

Abstract: Vessels to house the adsorbent beds for a machine for concentrating the oxygen in air for medical purposes, utilizing a pressure swing adsorption (PSA) technique, to provide a lightweight, reliable and compact device especially suited for home use.

Abstract: A machine for concentrating the oxygen in air for medical purposes utilizing any pressure swing adsorption (PSA) technique and comprising a combination of features to provide a light weight, reliable and compact device, especially suited for home use.

Abstract: A machine for concentrating the oxygen in air for medical purposes utilizing any pressure swing adsorption (PSA) technique and comprising a combination of features to provide a light weight, reliable and compact device, especially suited for home use.

Abstract: A pressure swing adsorption process and system including at least two adsorption beds and a segregated storage adsorption bed which is isolated from direct communication with the feed gas stream. During the process the pressures in the adsorption beds are equalized from the feed ends thereof at the end of adsorption in one of the beds and after pressurization of the other bed. The segregated storage adsorption bed is pressure equalized with a depressurizing adsorption bed and then after purging of the bed the segregated storage adsorption bed is equalized with that adsorption bed during repressurizing thereof. A pair of flow control valves are connected in a gas flow path connected to the outlets of the adsorption beds, each valve being located adjacent a corresponding one of the beds and allowing unrestricted flow away from the corresponding bed and controlled flow toward that bed.

Abstract: A pressure swing adsorption process and system including at least two adsorption beds and a segregated storage adsorption bed which is isolated from direct communication with the feed gas stream. During the process the pressures in the adsorption beds are equalized from the feed ends thereof at the end of adsorption in one of the beds and after pressurization of the other bed. The segregated storage adsorption bed is pressure equalized with a depressurizing adsorption bed and then after purging of the bed the segregated storage adsorption bed is equalized with that adsorption bed during repressurizing thereof. A pair of flow control valves are connected in a gas flow path connected to the outlets of the adsorption beds, each valve being located adjacent a corresponding one of the beds and allowing unrestricted flow away from the corresponding bed and controlled flow toward that bed.