Granted Patent
Utility
US 5,161,941 · App. 07/573,850
Actuator assembly for controlling inlet air flow to centrifugal fans
Inventor:
David A. Ratner
Patented Case
View Patent ↗
Granted: Nov 10, 1992
Filed: Aug 28, 1990
Inventor
David A. Ratner
Assignee (at issue)
Sinko Kogyo Co., Ltd.
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.