Evolution of wearable devices through patent drawings

Hearing aid patent from 1939

One of the most successful categories of electronic wearable devices is one that most people never think of - hearing aids. This patent was filed in 1939 and features a wearable bone-conduction hearing aid.

U.S. Patent number: 2249572

Filed: March 22, 1939

Publication date: July 15, 1941

Assignee: Dora Lieber, Lieber Patents Corp.

Image taken from U.S. Patent 2249572 - Digitized by Google

To read more about wearables, visit ZDNet's special feature: Wearables - Fit for Business?

Google Patent Search


Teena Maddox is a Senior Writer at TechRepublic, covering hardware devices, IoT, smart cities and wearables. With a background in fashion writing at People and W magazines and WWD, she ties together the style and substance of tech.

Free Newsletters, In your Inbox