Abstract: An oxygen concentrator for delivering consistent doses of an oxygen concentrated gas to a user by adjusting the delivery time according to the ambient air pressure at the time of delivery.

Abstract: A compact and highly portable combination pressure swing adsorption apparatus and product gas conservation device for medical use, to produce efficiently a gas with a high concentration of oxygen and to deliver the oxygen concentrated gas to a user at selectable times and in selectable doses, in which the operating components are detachably mounted together as a single unit.

Abstract: An oxygen concentrator for delivering consistent doses of an oxygen concentrated gas to a user by adjusting the delivery time according to the operating pressure and/or temperature of the gas at the time of delivery.

Abstract: A multiple fluid flow controller valve device having radially disposed a number of valves and a central rotary shaft with cam surfaces functioning as the valve controller to open and close the valves in the desired sequence.

Abstract: A sound enclosure for a pressure swing adsorption apparatus producing an oxygen concentrated gas having two sections to enclose the apparatus, the apparatus nested in the enclosure and the enclosure having an inlet for allowing ambient air into the enclosure and an outlet for enabling waste gases from the apparatus to exit the enclosure, and causing the ambient air and waste gases substantially to change direction within the enclosure before entering or exiting the apparatus. The sound enclosure further includes a flexible seal for isolating from each other the interior spaces of the two sections when a pressure swing adsorption apparatus is enclosed by the enclosure. Also disclosed is a compact and highly portable combination pressure swing adsorption apparatus and product gas conservation device for medical use, to produce efficiently a gas with a high concentration of oxygen and to deliver the oxygen concentrated gas to a user at selectable times and in selectable doses.

Abstract: A compact compressor including one or more heads. Each of the compressor heads is configured with at least one of the intake and output valves incorporated into the piston head. The compact compressor also has a cylinder with a reduced mass, increased surface area, and metal to metal contact with the housing for greater dissipation of heat generated by the compressor.