Granted Patent
Utility
US 4,563,136 · App. 06/722,331
High torque low speed hydraulic motor with rotary valving
Inventors:
Edward H. Gervais, Carle A. Middlekauff, Donald C. Wescott
Patented Case
View Patent ↗
Granted: Jan 7, 1986
Filed: Apr 12, 1985
Inventors
Edward H. Gervais
Carle A. Middlekauff
Donald C. Wescott
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.