Granted Patent
Utility
US 5,275,501 · App. 07/803,549
Quick opening manhole cover assembly for use with virtually any shape manhole cover
Inventors:
Franklyn J. Amorese, Robert R. Loomis
Patented Case
View Patent ↗
Granted: Jan 4, 1994
Filed: Dec 9, 1991
Inventors
Franklyn J. Amorese
Robert R. Loomis
Assignee (at issue)
PFAUDLER GMBH
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.