Granted Patent
Utility
US 5,019,121 · App. 07/528,432
Helical fluid-actuated torsional motor
Inventor:
Allan I. Krauter
Patented Case
View Patent ↗
Granted: May 28, 1991
Filed: May 25, 1990
Inventor
Allan I. Krauter
Assignee (at issue)
Welch Allyn, 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.