Granted Patent
Utility
US 5,020,601 · App. 07/499,065
Concealed sprinkler assembly
Inventors:
James G. Retzloff, Gerald W. Sanders
Patented Case
View Patent ↗
Granted: Jun 4, 1991
Filed: Mar 26, 1990
Inventors
James G. Retzloff
Gerald W. Sanders
Assignee (at issue)
Viking Group, 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.