Inogen, Inc., a medical technology company, primarily develops, manufactures, and markets portable oxygen concentrators for 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; and Inogen At Home stationary oxygen concentrators, as well as related accessories. The company also rents its products directly to patients. Inogen, Inc. was founded in 2001 and is headquartered in Goleta, California.