Granted Patent
Utility
US 4,875,404 · App. 07/215,776
Compact fluid powered actuator
Inventor:
Lewis L. Aldridge
Patented Case
View Patent ↗
Granted: Oct 24, 1989
Filed: Jul 5, 1988
Inventor
Lewis L. Aldridge
Assignee (at issue)
EWAL Manufacturing Co., Inc.
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.