Granted Patent
Utility
US 4,394,098 · App. 06/203,537
Radial gate having fine tuning of flow control
Inventors:
Helmut H. Wirschal, Warren G. Whippen
Patented Case
View Patent ↗
Granted: Jul 19, 1983
Filed: Nov 3, 1980
Inventors
Helmut H. Wirschal
Warren G. Whippen
Assignee (at issue)
Allis-Chalmers 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.