Granted Patent
Utility
US 5,678,592 · App. 08/624,848
Back flow prevention device
Inventors:
John A. Boticki, James H. Lohr, Charles E. Seaman, Jr.
Patented Case
View Patent ↗
Granted: Oct 21, 1997
Filed: Mar 26, 1996
Inventors
John A. Boticki
James H. Lohr
Charles E. Seaman, Jr.
Assignee (at issue)
S. C. JOHNSON & SON, 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.