Skyline robotics, which makes automated systems for cleaning exterior windows on high-rise buildings, announced that it had closed a $3.35 million funding round. With previous rounds, the company says that it has raised in all $12 million.

"Skyline's successful funding round comes on the heels of the company being granted key patents in Japan and Singapore for its Ozmo window-cleaning platform," the firm said. "Skyline Robotics is in the midst of a worldwide expansion with the first robots already deployed in New York City and go-to-market strategies now being put into action for various major cities on a global scale."

The Ozmo system combines, as one familiar with technical announcements might expect, artificial intelligence, machine learning, and light detection and ranging, known as LiDAR, with robotics and sensors. All would be necessary to allow a robot to clean a window.