Pair of interacting gear rims of the rotary machine
Pendulum piston motor
Peripherally pivoted oscillating vane machine
Piston and slipper arrangement for hydraulic pump or motor
Pneumatic motor improvements and pneumatic tools...
Poly-induction energy turbine without back draught
Poly-induction energy-efficient motor
Polyturbine and anti-discharge
Polyturbine with backflow preventer ii
Positive displacement compressor/turbine
Positive displacement fluid machine
Positive displacement machine with reciprocating and...
Positive displacement motor/progressive cavity pump
Positive displacement rotary device and method of use
Positive displacement vane type rotary pump
Positive-displacement rotary machine
Post mechanical, retromechanical and bimechanical motor...
Post-mechanical, retro-mechanical and bimechanical...
Post-rotary, retro-rotary and bi-rotary prime movers...
Post-rotating, back-rotating and dual-rotating prime movers...