Granted Patent
Utility
US 6,074,130 · App. 09/160,940
Inside drop system for manholes
Inventor:
Lee A. Duran
Patented Case
View Patent ↗
Granted: Jun 13, 2000
Filed: Sep 25, 1998
Inventor
Lee A. Duran
Assignee (at issue)
DURAN GROUP 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.