Granted Patent
Utility
US 5,252,939 · App. 07/951,259
Low friction solenoid actuator and valve
Inventors:
Roger G. Riefler, Kenton L. Durham
Patented Case
View Patent ↗
Granted: Oct 12, 1993
Filed: Sep 25, 1992
Inventors
Roger G. Riefler
Kenton L. Durham
Assignee (at issue)
Parker-Hannifin Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.