Granted Patent
Utility
US 5,097,906 · App. 07/535,923
Concealed automatic sprinkler
Inventor:
George S. Polan
Patented Case
View Patent ↗
Granted: Mar 24, 1992
Filed: Jun 11, 1990
Inventor
George S. Polan
Assignee (at issue)
CENTRAL SPRINKLER 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.