Inventor · disambiguated record
Roy J. Hartfield, Jr.
Also filed as: HARTFIELD JR ROY J · HARTFIELD ROY
4 granted patents·1 pending application·13 citations·filing 2008–2018
67Inventor score
Top patents by PatentIndex Score
5 records- 0164US8567178B2Positive displacement rotary vane engineHARTFIELD JR ROY J·Filed 2011·Granted Oct 29, 2013·1 cites·15 claims
- 0260US8790081B1Constant torque propeller mechanismBURGER CHRISTOPH·Filed 2008·Granted Jul 29, 2014·11 cites·26 claims
- 0352US2014020384A1Positive displacement rotary vane engineHARTFIELD JR ROY J·Filed 2013·Application pending·0 cites
- 0443US8037863B2Positive displacement rotary vane engineHARTFIELD JR ROY J·Filed 2008·Granted Oct 18, 2011·1 cites·18 claims
- 0531US11123220B1Gas delivery system for cryochamberCRYOXCEL LLC·Filed 2018·Granted Sep 21, 2021·0 cites·23 claims
Join the waitlist — get patent alerts
Get an alert when Roy J. Hartfield, Jr. files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →