In 1881 Israel L. Landis got a patent for a similar oscillating motor. A year later (1882), the Iske brothers got a patent for a similar motor. Unlike the drinking bird, the lower tank was heated and the upper tank just air-cooled in this engine. Other than that, it used the same principle. The Iske brothers during that time got various patents on a related engine which is now known as Minto wheel.