Granted Patent
Utility
US 4,593,507 · App. 06/669,074
Trenchless underfloor conduit system
Inventor:
Thomas W. Hartman
Patented Case
View Patent ↗
Granted: Jun 10, 1986
Filed: Nov 7, 1984
Inventor
Thomas W. Hartman
Assignee (at issue)
Cyclops 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.