Granted Patent
Utility
US 4,558,173 · App. 06/412,478
Hazardous location expansion fitting
Inventors:
Padej Gajajiva, Eigil Wium
Patented Case
View Patent ↗
Granted: Dec 10, 1985
Filed: Aug 30, 1982
Inventors
Padej Gajajiva
Eigil Wium
Assignee (at issue)
Federal Signal 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.