Granted Patent
Utility
US 4,505,612 · App. 06/523,120
Air admission apparatus for water control gate
Inventor:
George W. Shelley, Jr.
Patented Case
View Patent ↗
Granted: Mar 19, 1985
Filed: Aug 15, 1983
Inventor
George W. Shelley, Jr.
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.