Inogen, Inc. is a medical technology company, which engages in the development, manufacture, and marketing of portable oxygen concentrators used to deliver supplemental long-term oxygen therapy to patients suffering from chronic respiratory conditions. Its products include Inogen One G4 system, Inogen One G3 system, Inogen One G5 system, Inogen TAV, and Inogen at Home. The company was founded by Alison Perry, Alison K. Bauerlein, Brenton Taylor, and Byron Myers on November 27, 2001 and is headquartered in Goleta, CA.