Roy J. Hartfield, Jr.

AU Auburn University: 1 patents #267 of 580Top 50%

📍 Auburn, AL: #117 of 511 inventorsTop 25%

🗺 Alabama: #1,893 of 10,951 inventorsTop 20%

Overall (All Time): #1,159,616 of 4,157,543Top 30%

Patents All Time

Issued Patents All Time

Showing 1–4 of 4 patents

Patent #	Title	Co-Inventors	Date
11123220	Gas delivery system for cryochamber	John Mann	2021-09-21
8790081	Constant torque propeller mechanism	Christoph Burger	2014-07-29
8567178	Positive displacement rotary vane engine	—	2013-10-29
8037863	Positive displacement rotary vane engine	—	2011-10-18