Granted Patent
Utility
US 6,116,568 · App. 09/070,302
Apparatus for forming voids under concrete floors
Inventors:
Michael L. Rosenblat, Timothy J. Isles, Louis C. Dufault
Patented Case
View Patent ↗
Granted: Sep 12, 2000
Filed: Apr 30, 1998
Inventors
Michael L. Rosenblat
Timothy J. Isles
Louis C. Dufault
Assignee (at issue)
Voidform International Ltd.
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.