MicroUnity holds 56 patents and has published 14 additional patent applications.

In an additional patent application he adapted the engine for subsonic speed.

Anoto holds more than 300 international patents on their technology and some 300 additional patent applications.

Additional patent applications were filed during the 1940s, and a significant increase in patent applications for various mechanical hackamore designs occurred from the 1950s forward.

Protean has been awarded 23 patents for its technology and design, and more than 73 additional patent applications have been filed internationally and with specific countries in North America, Europe and Asia.