Successive Stages Patents (Class 417/244)
- Crankcase forms stage or interstage flow path (Class 417/255)
- Stages comprise oppositely moving valved pumping members (Class 417/256)
- Reciprocating cylinder and piston (Class 417/258)
- Including valved piston (Class 417/259)
- Relatively movable (Class 417/265)
- Three or more (Class 417/266)
- Series double acting (Class 417/267)
- Unidirectionally acting rigidly connected pumping members (Class 417/268)