Inogen, Inc., a medical technology company, develops, manufactures, and markets portable oxygen concentrators to patients, physicians and other clinicians, and third-party payors in the United States and internationally. Its oxygen concentrators are used to deliver supplemental long-term oxygen therapy to patients suffering from chronic respiratory conditions. The company offers Inogen One, a portable device that concentrate the air around the patient to provide a single source of supplemental oxygen; Inogen At Home stationary oxygen concentrators; Inogen Tidal Assist Ventilators, as well as related accessories. The company also rents its products directly to patients. Inogen, Inc. was incorporated in 2001 and is headquartered in Goleta, California.